Basic Physics Questions and Answers
![79 The orbital velocity of a satellite is given by the GM expression V V R h Earth R is the radius of the Earth and h is the height of the satellite from the surface of the Earth Explain the reasons why the geostationary satellite is not pos sible to set in orbit around the Earth at two different heights from the surface of the Earth 9 here M is the mass of the 80 A body is dropped from a height of 40 m from the surface of the Farth Its final l 28 m 5 1](https://media.kunduz.com/media/sug-question-candidate/20210612054718009767-3500674.jpg?w=256)
Physics
Basic Physics79 The orbital velocity of a satellite is given by the GM expression V V R h Earth R is the radius of the Earth and h is the height of the satellite from the surface of the Earth Explain the reasons why the geostationary satellite is not pos sible to set in orbit around the Earth at two different heights from the surface of the Earth 9 here M is the mass of the 80 A body is dropped from a height of 40 m from the surface of the Farth Its final l 28 m 5 1
![35 Displacement current is set up between the plates of a capacitor when the potential difference across the plates is 1 Maximum 2 Zero 3 Minimum 4 Varying](https://media.kunduz.com/media/sug-question-candidate/20210621023626297828-2662149.jpg?w=256)
Physics
Basic Physics35 Displacement current is set up between the plates of a capacitor when the potential difference across the plates is 1 Maximum 2 Zero 3 Minimum 4 Varying
![34 Mark the incorrect statement 1 In any AC circuit the applied instantaneous voltage equals to the algebraic sum of the instantaneous voltages across the series elements of the circuit 2 For circuits used for transporting electric power a low power factor implies large power loss in transmission 3 Power factor can often be improved by the use of a capacitor of appropriate capacitance in the circuit 4 The use of a capacitor is avoided in the circuit of an induction coil](https://media.kunduz.com/media/sug-question-candidate/20210621023610270825-2662149.jpg?w=256)
Physics
Basic Physics34 Mark the incorrect statement 1 In any AC circuit the applied instantaneous voltage equals to the algebraic sum of the instantaneous voltages across the series elements of the circuit 2 For circuits used for transporting electric power a low power factor implies large power loss in transmission 3 Power factor can often be improved by the use of a capacitor of appropriate capacitance in the circuit 4 The use of a capacitor is avoided in the circuit of an induction coil
![26 A cubical region of space is filled with some uniform electric and magnetic field An electron enters the cube across one of its faces with velocity v and a positron enters via opposite face with velocity v At this instant which one of the following is not correct a The electric forces on both the particles cause identical accelerations b The magnetic forces on both the particles cause equal acceleration c Both particles gain or loose energy at the same rate d The motion of the centre of mass is determined by B alone](https://media.kunduz.com/media/sug-question-candidate/20210612054949990005-2662149.jpg?w=256)
Physics
Basic Physics26 A cubical region of space is filled with some uniform electric and magnetic field An electron enters the cube across one of its faces with velocity v and a positron enters via opposite face with velocity v At this instant which one of the following is not correct a The electric forces on both the particles cause identical accelerations b The magnetic forces on both the particles cause equal acceleration c Both particles gain or loose energy at the same rate d The motion of the centre of mass is determined by B alone
![21 Identify the correct definition 1 If after every certain interval of time particle repeats its motion then motion is called periodic motion 2 To and fro motion of a particle over the same path about its mean position in certain time interval is called oscillatory motion 3 Oscillatory motion described in terms of single sine and cosine functions is called simple harmonic motion 4 All of these](https://media.kunduz.com/media/sug-question-candidate/20210621023001013563-2662149.jpg?w=256)
Physics
Basic Physics21 Identify the correct definition 1 If after every certain interval of time particle repeats its motion then motion is called periodic motion 2 To and fro motion of a particle over the same path about its mean position in certain time interval is called oscillatory motion 3 Oscillatory motion described in terms of single sine and cosine functions is called simple harmonic motion 4 All of these
![70 Two coils A and B having turns 300 and 600 respectively are placed near each other on passing a current of 3 0 ampere in A the flux linked with A is 1 2x104 weber and with B it is 9 0 10 5 weber The mutual inductance of the system is MP PMT 2001 tap a 2x 10 5 henry c 4 10 5 henry b 3 x 105 henry d 6 x 10 5 henry](https://media.kunduz.com/media/sug-question-candidate/20210419050747852307-2349609.jpg?w=256)
Physics
Basic Physics70 Two coils A and B having turns 300 and 600 respectively are placed near each other on passing a current of 3 0 ampere in A the flux linked with A is 1 2x104 weber and with B it is 9 0 10 5 weber The mutual inductance of the system is MP PMT 2001 tap a 2x 10 5 henry c 4 10 5 henry b 3 x 105 henry d 6 x 10 5 henry
![24 Five balls marked a to e are suspended using separate threads Pairs b c and d e show electrostatic repulsion while pairs a b c e and a e show electrostatic attraction The ball marked a must be 1 Negatively charged 2 Positively charged 3 Uncharged 4 Any of the above is possible](https://media.kunduz.com/media/sug-question-candidate/20210621023051149529-2662149.jpg?w=256)
Physics
Basic Physics24 Five balls marked a to e are suspended using separate threads Pairs b c and d e show electrostatic repulsion while pairs a b c e and a e show electrostatic attraction The ball marked a must be 1 Negatively charged 2 Positively charged 3 Uncharged 4 Any of the above is possible
![1 The least count of a stop watch is 5 s The time of 20 oscillations of a pendulum is measured to be 25s What is the maximum percentage error in this meas urement 1 8 2 1 3 0 8 4 16 The refractive index of water measured by the relation](https://media.kunduz.com/media/sug-question-candidate/20210612055929073325-2328185.jpg?w=256)
Physics
Basic Physics1 The least count of a stop watch is 5 s The time of 20 oscillations of a pendulum is measured to be 25s What is the maximum percentage error in this meas urement 1 8 2 1 3 0 8 4 16 The refractive index of water measured by the relation
![17 Select the correct statement for work heat and change in internal energ 1 Heat supplied and work done depend on initial and final states 2 Change in internal energy depends on the initial and final states only 3 Heat and work depend on the path between the two points 4 All of these](https://media.kunduz.com/media/sug-question-candidate/20210621022804030244-2662149.jpg?w=256)
Physics
Basic Physics17 Select the correct statement for work heat and change in internal energ 1 Heat supplied and work done depend on initial and final states 2 Change in internal energy depends on the initial and final states only 3 Heat and work depend on the path between the two points 4 All of these
![A charged metallic bob of mass m and charge Q is in equilibrium in presence of electric repulsion by Q fixed as shown in fig Find Q 60 L L fixed 1 2 mg L 2 4 mg L 3 8 mg L 4 None](https://media.kunduz.com/media/sug-question-candidate/20210419013031609971-3332096.jpg?w=256)
Physics
Basic PhysicsA charged metallic bob of mass m and charge Q is in equilibrium in presence of electric repulsion by Q fixed as shown in fig Find Q 60 L L fixed 1 2 mg L 2 4 mg L 3 8 mg L 4 None
![29 A proton and an a particle enter in a uniform magnetic field perpendicularly with same speed The ratio of time periods of both particle will be c 2 1 a 1 2 b 1 3 30 A proton a douters d 3 1](https://media.kunduz.com/media/sug-question-candidate/20210612055046600090-2662149.jpg?w=256)
Physics
Basic Physics29 A proton and an a particle enter in a uniform magnetic field perpendicularly with same speed The ratio of time periods of both particle will be c 2 1 a 1 2 b 1 3 30 A proton a douters d 3 1
![3 A charged particle would continue to move with a constant velocity in a region wherein which of the following conditions is not correct b E 0 B 0 d E 0 B 0 a E 0 B 0 c E 0 B 0](https://media.kunduz.com/media/sug-question-candidate/20210612054823208691-2662149.jpg?w=256)
Physics
Basic Physics3 A charged particle would continue to move with a constant velocity in a region wherein which of the following conditions is not correct b E 0 B 0 d E 0 B 0 a E 0 B 0 c E 0 B 0
![Two simple pendulums are suspended from the same point using identical ideal non conducting string and when supplied with identical charges to the bobs they get deflected and attain equilibrium with the angle between strings as 120 If the pendulum system is kept in a liquid o density equal to th of density of the bob the angle between the two strings is halved The dielectric constant of the liquid is](https://media.kunduz.com/media/sug-question-candidate/20210612043811292648-3443308.jpg?w=256)
Physics
Basic PhysicsTwo simple pendulums are suspended from the same point using identical ideal non conducting string and when supplied with identical charges to the bobs they get deflected and attain equilibrium with the angle between strings as 120 If the pendulum system is kept in a liquid o density equal to th of density of the bob the angle between the two strings is halved The dielectric constant of the liquid is
![1 An electron having momentum 2 4 x 10 23 kg m s enters a region of uniform magnetic field of 0 15 T The field vector makes an angle of 30 with the initial velocity vector of the electron The radius of the helical path of the electron in the field shall be 3 a 2 mm b 1 mm c mm d 0 5 mm](https://media.kunduz.com/media/sug-question-candidate/20210612054752219463-2662149.jpg?w=256)
Physics
Basic Physics1 An electron having momentum 2 4 x 10 23 kg m s enters a region of uniform magnetic field of 0 15 T The field vector makes an angle of 30 with the initial velocity vector of the electron The radius of the helical path of the electron in the field shall be 3 a 2 mm b 1 mm c mm d 0 5 mm
![A 2 F capacitor C is first charged to a potential difference of 10 V using a battery Then the thong battery is removed and the capacitor is methongo connected to an uncharged capacitor C of 8uF mathango The charge in C on equilibrium condition C Round off to the Nearest mothongo 15 mathongo mathonge mash mathongo mathonge math mathongo mathongs math mathongo mathongs maths](https://media.kunduz.com/media/sug-question-candidate/20210612052934411624-3473012.jpg?w=256)
Physics
Basic PhysicsA 2 F capacitor C is first charged to a potential difference of 10 V using a battery Then the thong battery is removed and the capacitor is methongo connected to an uncharged capacitor C of 8uF mathango The charge in C on equilibrium condition C Round off to the Nearest mothongo 15 mathongo mathonge mash mathongo mathonge math mathongo mathongs math mathongo mathongs maths
![16 A charged particle is moving on circular path with velocity v in a uniform magnetic field B if the velocity of the charged particle is doubled and strength of magnetic field is halved then radius becomes](https://media.kunduz.com/media/sug-question-candidate/20210612054646731359-2662149.jpg?w=256)
Physics
Basic Physics16 A charged particle is moving on circular path with velocity v in a uniform magnetic field B if the velocity of the charged particle is doubled and strength of magnetic field is halved then radius becomes
![period z m k U A block of mass m is suspended from the ceiling of a stationary standing elevator through a spring of spring constant k Suddenly the cable breaks and the elevator starts falling freely Show that the block now executes a](https://media.kunduz.com/media/sug-question-candidate/20210612054209627497-2983979.jpg?w=256)
Physics
Basic Physicsperiod z m k U A block of mass m is suspended from the ceiling of a stationary standing elevator through a spring of spring constant k Suddenly the cable breaks and the elevator starts falling freely Show that the block now executes a
![following is true We can find mass of photon by p mv Rest mass of photon is not zero Cut off stopping voltage or is independent of frequency Threshold wavelength depends upon](https://media.kunduz.com/media/sug-question-candidate/20210523095540392084-3257151.jpg?w=256)
Physics
Basic Physicsfollowing is true We can find mass of photon by p mv Rest mass of photon is not zero Cut off stopping voltage or is independent of frequency Threshold wavelength depends upon
![40 Which of the following statements is wrong 1 bimetal is used in metal thermometers 2 bimetal is used in thermostal for regulating 3 bimetal relays are used to open or close 4 bimetal are used to generate electricity](https://media.kunduz.com/media/sug-question-candidate/20210418175521276322-2983979.jpg?w=256)
Physics
Basic Physics40 Which of the following statements is wrong 1 bimetal is used in metal thermometers 2 bimetal is used in thermostal for regulating 3 bimetal relays are used to open or close 4 bimetal are used to generate electricity
![0 The relation between an ac voltage source and time in SI units is V 120 sin 100 t cos 100 t V The value of peak voltage and frequency will be respectively a 120 V and 100 Hz c 60 V and 200 Hz 120 b V and 100 Hz d 60 V and 100 Hz](https://media.kunduz.com/media/sug-question-candidate/20210612053846293060-3480709.jpg?w=256)
Physics
Basic Physics0 The relation between an ac voltage source and time in SI units is V 120 sin 100 t cos 100 t V The value of peak voltage and frequency will be respectively a 120 V and 100 Hz c 60 V and 200 Hz 120 b V and 100 Hz d 60 V and 100 Hz
![31 A loop of irregular shape made of flexible conducting wire carrying clockwise current is placed in uniform inward magnetic field such that its plane is perpendicular to the field Then the loop 1 Experiences force 2 Develops induced current for a short time 3 Changes to circular loop 4 All of these](https://media.kunduz.com/media/sug-question-candidate/20210621001657126938-2662149.jpg?w=256)
Physics
Basic Physics31 A loop of irregular shape made of flexible conducting wire carrying clockwise current is placed in uniform inward magnetic field such that its plane is perpendicular to the field Then the loop 1 Experiences force 2 Develops induced current for a short time 3 Changes to circular loop 4 All of these
![the figure shown a cart moves on a smooth horizontal surface with a constant velocity v acted upon by an external nstant force of magnitude F Sand falls on to the cart with negligible velocity at constant rate u kg s and sticks to the cart nd N if the power supplied by external agent applying the force F is vN M F](https://media.kunduz.com/media/sug-question-candidate/20210612052508461752-3485433.jpg?w=256)
Physics
Basic Physicsthe figure shown a cart moves on a smooth horizontal surface with a constant velocity v acted upon by an external nstant force of magnitude F Sand falls on to the cart with negligible velocity at constant rate u kg s and sticks to the cart nd N if the power supplied by external agent applying the force F is vN M F
![An infinitely long line charge having a uniform charge per unit length A lies a distance d from poin O as shown in Figure Determine the total electric flux through the surface of a sphere of radius A centered at O resulting from this line charge R d 2 R d AR A C A R d 28 B D 4 22 R d](https://media.kunduz.com/media/sug-question-candidate/20210612054055947125-1914404.jpg?w=256)
Physics
Basic PhysicsAn infinitely long line charge having a uniform charge per unit length A lies a distance d from poin O as shown in Figure Determine the total electric flux through the surface of a sphere of radius A centered at O resulting from this line charge R d 2 R d AR A C A R d 28 B D 4 22 R d
![A parallel plate capacitor has plate area 100 m and plate separation of 10 m The space between the plates is filled up to a thickness 5 m with a material of dielectric constant of 10 The resultant capacitance of the system mathon mathongo mathenge is x pF The value of eo 8 85 x 10 12 F m 1 The value of x to the nearest integer is mathongo](https://media.kunduz.com/media/sug-question-candidate/20210612053255145136-3473012.jpg?w=256)
Physics
Basic PhysicsA parallel plate capacitor has plate area 100 m and plate separation of 10 m The space between the plates is filled up to a thickness 5 m with a material of dielectric constant of 10 The resultant capacitance of the system mathon mathongo mathenge is x pF The value of eo 8 85 x 10 12 F m 1 The value of x to the nearest integer is mathongo
![Two vectors of equal magnitude 5 unit have an angle 60 between them Find the magnitude of a the sum of the vectors and b the difference of the vectors to A B A Figure 2 7 B B 60 120 D 17 100t A](https://media.kunduz.com/media/sug-question-candidate/20210523085309503646-3443560.jpg?w=256)
Physics
Basic PhysicsTwo vectors of equal magnitude 5 unit have an angle 60 between them Find the magnitude of a the sum of the vectors and b the difference of the vectors to A B A Figure 2 7 B B 60 120 D 17 100t A
![A sample of hydrogen gas in its ground state is irradiated with photons of 10 2 eV energies The radiation from the above sample is used to irradiate two other samples of excited ionized Het and excited ionized Li respectively Both the ionized samples absorb the incident radiation How many spectral lines are obtained in the spectra of Li A B 10 15 Correct Answer 20](https://media.kunduz.com/media/sug-question-candidate/20210620191059846869-3052306.jpg?w=256)
Physics
Basic PhysicsA sample of hydrogen gas in its ground state is irradiated with photons of 10 2 eV energies The radiation from the above sample is used to irradiate two other samples of excited ionized Het and excited ionized Li respectively Both the ionized samples absorb the incident radiation How many spectral lines are obtained in the spectra of Li A B 10 15 Correct Answer 20
![In the arrang shown in the figure the string is light and inextensible and friction is absent everywhere Find the speed of both the blocks after the block A has ascended a height of Given that and Take 1 m m 1 kg MA mg 2 kg mB g 10 m s](https://media.kunduz.com/media/sug-question-candidate/20210523083511180756-750908.jpg?w=256)
Physics
Basic PhysicsIn the arrang shown in the figure the string is light and inextensible and friction is absent everywhere Find the speed of both the blocks after the block A has ascended a height of Given that and Take 1 m m 1 kg MA mg 2 kg mB g 10 m s
![ma A particle of mass m moves in a circular orbit in a central potential field U r Uor4 If Bohr s quantizatio conditions are applied radii of mathango possible orbitals ru vary with n a where a is mothongu mathongo mathongo mathongo mathongomathongo mathan](https://media.kunduz.com/media/sug-question-candidate/20210612044340819335-3473012.jpg?w=256)
Physics
Basic Physicsma A particle of mass m moves in a circular orbit in a central potential field U r Uor4 If Bohr s quantizatio conditions are applied radii of mathango possible orbitals ru vary with n a where a is mothongu mathongo mathongo mathongo mathongomathongo mathan
![20 Which of the following material is most suitable for cooking utensil 1 Low conductivity and low specific heat 2 High conductivity and low specific heat 3 Low conductivity and high specific heat 4 High conductivity and high specific heat](https://media.kunduz.com/media/sug-question-candidate/20210620203816083539-2662149.jpg?w=256)
Physics
Basic Physics20 Which of the following material is most suitable for cooking utensil 1 Low conductivity and low specific heat 2 High conductivity and low specific heat 3 Low conductivity and high specific heat 4 High conductivity and high specific heat
![The following measurements were made over a lake Incoming shortwave radiations R 400 Wm surface albedo a 0 25 air temperature T 15 C lake surface temperature T 20 C relative humidia RH 70 a Find the net radiation at the surface of the lake What is the dew point temperature of the air Useful Data TABLE 3 1 TYPICAL BROADBAND EMISSIVITY FOR VARYING LAND SURFACE TYPES FROM ARYA 2001 SURFACE TYPE Water Snow old Snow fresh Ice Bare soil Grass long 1 m Grass short 0 02 m Agricultural crops Forests EMISSIVITY 0 92 0 97 0 82 0 89 0 90 0 99 0 92 0 97 0 84 0 97 0 90 0 95 0 90 0 99 0 97 0 99](https://media.kunduz.com/media/sug-question-candidate/20210620221159213252-3443308.jpg?w=256)
Physics
Basic PhysicsThe following measurements were made over a lake Incoming shortwave radiations R 400 Wm surface albedo a 0 25 air temperature T 15 C lake surface temperature T 20 C relative humidia RH 70 a Find the net radiation at the surface of the lake What is the dew point temperature of the air Useful Data TABLE 3 1 TYPICAL BROADBAND EMISSIVITY FOR VARYING LAND SURFACE TYPES FROM ARYA 2001 SURFACE TYPE Water Snow old Snow fresh Ice Bare soil Grass long 1 m Grass short 0 02 m Agricultural crops Forests EMISSIVITY 0 92 0 97 0 82 0 89 0 90 0 99 0 92 0 97 0 84 0 97 0 90 0 95 0 90 0 99 0 97 0 99
![The atomic hydrogen emits a line spectrum consisting of various series Which series of hydrogen atomic mathangamathongo mathongs mathongs spectra is lying in the visible region mathongo 1 Brackett series 2 Paschen series mathongo mathongo](https://media.kunduz.com/media/sug-question-candidate/20210612044248399103-3473012.jpg?w=256)
Physics
Basic PhysicsThe atomic hydrogen emits a line spectrum consisting of various series Which series of hydrogen atomic mathangamathongo mathongs mathongs spectra is lying in the visible region mathongo 1 Brackett series 2 Paschen series mathongo mathongo
![Your physics assignment is to figure out a way to use electricity to launch a small 6cm long plastic stirrer You decide that you will charge the little plastic rod by rubbing it fur then hold it near a long charged wire When you let go the electric force of wire on the plastic rod will shoot it away Suppose you can uniformly charge the plastic stirrer to 10nC and that the linear charge density of the long wire is 10 7 C m The mass of plastic stirrer is 1kg OM 12 The electric force on the plastic stirrer if the end closest to the wire is 2cm away is A 4 2 10 N B 2 8 10 N C 1 4 10 N D 8 5 x 104N](https://media.kunduz.com/media/sug-question-candidate/20210418120405379033-1865989.jpg?w=256)
Physics
Basic PhysicsYour physics assignment is to figure out a way to use electricity to launch a small 6cm long plastic stirrer You decide that you will charge the little plastic rod by rubbing it fur then hold it near a long charged wire When you let go the electric force of wire on the plastic rod will shoot it away Suppose you can uniformly charge the plastic stirrer to 10nC and that the linear charge density of the long wire is 10 7 C m The mass of plastic stirrer is 1kg OM 12 The electric force on the plastic stirrer if the end closest to the wire is 2cm away is A 4 2 10 N B 2 8 10 N C 1 4 10 N D 8 5 x 104N
![A charged parallel plate capacitor of distance d has U energy A slab of dielectric constant K and thickness d is then introduced between the plates of the capacitor The new energy of the system is given by 1 KU 2 K U 3 U 4 5](https://media.kunduz.com/media/sug-question-candidate/20210620173344188797-2351593.jpg?w=256)
Physics
Basic PhysicsA charged parallel plate capacitor of distance d has U energy A slab of dielectric constant K and thickness d is then introduced between the plates of the capacitor The new energy of the system is given by 1 KU 2 K U 3 U 4 5
![A particle of mass 1 kg is taken along the path ABCDE from A to E see figure The two hills are of heights 50 m and 100 m and the horizontal distance AE is 20 m while the path length is 400 m The coefficient of friction of the surface is 0 1 Take g 10 ms and 3 1 73 the minimum work on the masses required to accomplish this is A 20 J A B 173 J B C E C 400 J D O J](https://media.kunduz.com/media/sug-question-candidate/20210523053035340130-1914404.jpg?w=256)
Physics
Basic PhysicsA particle of mass 1 kg is taken along the path ABCDE from A to E see figure The two hills are of heights 50 m and 100 m and the horizontal distance AE is 20 m while the path length is 400 m The coefficient of friction of the surface is 0 1 Take g 10 ms and 3 1 73 the minimum work on the masses required to accomplish this is A 20 J A B 173 J B C E C 400 J D O J
![A boy wants to write the number in each field of the figure shown in the image Each number is the sum of the numbers in the neighbor fields neighbor fields are all fields that touch What number is going to be written in the middle field](https://media.kunduz.com/media/sug-question-candidate/20210418094001301239-3328556.jpg?w=256)
Physics
Basic PhysicsA boy wants to write the number in each field of the figure shown in the image Each number is the sum of the numbers in the neighbor fields neighbor fields are all fields that touch What number is going to be written in the middle field
![Two semicircular rings having same mass m and radius r are joined as shown in the figure The moment of inertia of the system about an axis passing through the centre of mass of the system and perpendicular to the plane of the figure is](https://media.kunduz.com/media/sug-question-candidate/20210418101635790896-1708416.jpg?w=256)
Physics
Basic PhysicsTwo semicircular rings having same mass m and radius r are joined as shown in the figure The moment of inertia of the system about an axis passing through the centre of mass of the system and perpendicular to the plane of the figure is
![A composite rod is made by joining two rods of ifferent materials and of same cross section If 12 are their initial lengths at t C then a the increase in length of composite rod at 12 C A1 4 1 1 12 41 given by The effective coefficient of linear expansion of](https://media.kunduz.com/media/sug-question-candidate/20210523065727090085-2240982.jpg?w=256)
Physics
Basic PhysicsA composite rod is made by joining two rods of ifferent materials and of same cross section If 12 are their initial lengths at t C then a the increase in length of composite rod at 12 C A1 4 1 1 12 41 given by The effective coefficient of linear expansion of
![15 Three boys are pushing horizontally a box placed on horizontal table One is pushing towards north with a 5 3N force The second is pushing towards east and third pushes with a force 10 N such that the box is in equilibrium Find the magnitude of the force second boy is applying in newton UD0015 Scalar product of vectors 16 UD0016 Consider the two vectors L l 23 3k and 7 41 5j 6k Find the value of the scalar a such that the vector L al is perpendicular to L](https://media.kunduz.com/media/sug-question-candidate/20210523060840441874-3441822.jpg?w=256)
Physics
Basic Physics15 Three boys are pushing horizontally a box placed on horizontal table One is pushing towards north with a 5 3N force The second is pushing towards east and third pushes with a force 10 N such that the box is in equilibrium Find the magnitude of the force second boy is applying in newton UD0015 Scalar product of vectors 16 UD0016 Consider the two vectors L l 23 3k and 7 41 5j 6k Find the value of the scalar a such that the vector L al is perpendicular to L
![If an electron is moving in the nth orbit of the hydrogen atom then its velocity vn for the nth orbit is given as mathongo mathongo 1 V x n 2 V x 3 V X n 4 V x mathongo mathongs mathongo mathongo mathongo mathongo mathongo moth](https://media.kunduz.com/media/sug-question-candidate/20210612043241369283-3473012.jpg?w=256)
Physics
Basic PhysicsIf an electron is moving in the nth orbit of the hydrogen atom then its velocity vn for the nth orbit is given as mathongo mathongo 1 V x n 2 V x 3 V X n 4 V x mathongo mathongs mathongo mathongo mathongo mathongo mathongo moth
![If electron of hydrogen atom is replaced by another particle of same charge but of double mass then O Bohr s radius will increase M lonisation energy of atom will be doubled Speed of new particle in given state will be lesser than electrons speed in same orbit Gap between energy levels will now be doubled](https://media.kunduz.com/media/sug-question-candidate/20210612035916514755-3485433.jpg?w=256)
Physics
Basic PhysicsIf electron of hydrogen atom is replaced by another particle of same charge but of double mass then O Bohr s radius will increase M lonisation energy of atom will be doubled Speed of new particle in given state will be lesser than electrons speed in same orbit Gap between energy levels will now be doubled
![Which of the following is null vector A Velocity vector of a body moving in a circle with a uniform speed B Position vector of the origin of the rectangular co ordinate system C Velocity vector of a body moving in a straight line with a uniform speed D Displacement vector of a stationary object](https://media.kunduz.com/media/sug-question-candidate/20210523030550421322-3443076.jpg?w=256)
Physics
Basic PhysicsWhich of the following is null vector A Velocity vector of a body moving in a circle with a uniform speed B Position vector of the origin of the rectangular co ordinate system C Velocity vector of a body moving in a straight line with a uniform speed D Displacement vector of a stationary object
![The current required to be passed in a solenoid of length 10 cm and number of turns 100 so that the magnet gets demagnetized when inside the solenoid is 3A The coercivity of a small magnet where the ferromagnet gets demagnetized is nx 10 A m Find the value of n](https://media.kunduz.com/media/sug-question-candidate/20210612035232576289-1262502.jpg?w=256)
Physics
Basic PhysicsThe current required to be passed in a solenoid of length 10 cm and number of turns 100 so that the magnet gets demagnetized when inside the solenoid is 3A The coercivity of a small magnet where the ferromagnet gets demagnetized is nx 10 A m Find the value of n
![An open container 2 x 2 base x 2m height half full with water is accelerated at 4 m S up a 15 incline take g 10 m sec Choose correc option water will not spill for given acceleration at acceleration 7 05 m s 1 the water begin to spill at acceleration 7 05 m s 1 the water doesn t spill water will spill for given acceleration](https://media.kunduz.com/media/sug-question-candidate/20210418093830399923-3168402.jpg?w=256)
Physics
Basic PhysicsAn open container 2 x 2 base x 2m height half full with water is accelerated at 4 m S up a 15 incline take g 10 m sec Choose correc option water will not spill for given acceleration at acceleration 7 05 m s 1 the water begin to spill at acceleration 7 05 m s 1 the water doesn t spill water will spill for given acceleration
![3 An ideal mono atomic gas is confined in a cylinder with the help of a piston that can slide inside the cylinder without friction Walls of the cylinder have finite conductivity Initially the piston is in equilibrium with its external surface exposed to the atmosphere at pressure 105 Pa A transient pulse of heat is injected into the cylinder through its walls causing the gas to expand until its volume changes by 0 2 L How much heat was supplied by the pulse a 20 J c 50 J b 30 J d 60 J](https://media.kunduz.com/media/sug-question-candidate/20210523030532423687-1927997.jpg?w=256)
Physics
Basic Physics3 An ideal mono atomic gas is confined in a cylinder with the help of a piston that can slide inside the cylinder without friction Walls of the cylinder have finite conductivity Initially the piston is in equilibrium with its external surface exposed to the atmosphere at pressure 105 Pa A transient pulse of heat is injected into the cylinder through its walls causing the gas to expand until its volume changes by 0 2 L How much heat was supplied by the pulse a 20 J c 50 J b 30 J d 60 J
![Some white colourless crystals are heated A cracking sound is heard and brown fumes are given off and the residue left is yellow brown in colour When a glowing splinter is held in the fumes it is relighted The fumes consist of A 0 C Cl B NO D NO and O](https://media.kunduz.com/media/sug-question-candidate/20210612035720447248-1262502.jpg?w=256)
Physics
Basic PhysicsSome white colourless crystals are heated A cracking sound is heard and brown fumes are given off and the residue left is yellow brown in colour When a glowing splinter is held in the fumes it is relighted The fumes consist of A 0 C Cl B NO D NO and O
![and the other same surface contact and face charge 5 An object flying in air with velocity 20 251 12k suddenly breaks in two pieces whose masses are in the ratio 1 5 The smaller mass flies off with a velocity 100 351 8k The velocity of the larger piece will be 1 4 23 16k 2 00 15 201 2 1001 351 8k 30 15 901](https://media.kunduz.com/media/sug-question-candidate/20210418072552636321-3165895.jpg?w=256)
Physics
Basic Physicsand the other same surface contact and face charge 5 An object flying in air with velocity 20 251 12k suddenly breaks in two pieces whose masses are in the ratio 1 5 The smaller mass flies off with a velocity 100 351 8k The velocity of the larger piece will be 1 4 23 16k 2 00 15 201 2 1001 351 8k 30 15 901
![A truck is stationary and has a bob suspended by a light string in a frame attached to the truck The truck suddenly moves to the right with an acceleration of a The pendulum will tilt 1 to the left and angle of inclination of the pendulum with the vertical is sin 9 9 a 2 to the left and angle of inclination of the pendulum a g 3 to the left and angle of inclination of the pendulum with the vertical is tan 1 a with the vertical is sin g 4 to the left and angle of inclination of the pendulum with the vertical is tan 1 g](https://media.kunduz.com/media/sug-question-candidate/20210418072910458154-3165895.jpg?w=256)
Physics
Basic PhysicsA truck is stationary and has a bob suspended by a light string in a frame attached to the truck The truck suddenly moves to the right with an acceleration of a The pendulum will tilt 1 to the left and angle of inclination of the pendulum with the vertical is sin 9 9 a 2 to the left and angle of inclination of the pendulum a g 3 to the left and angle of inclination of the pendulum with the vertical is tan 1 a with the vertical is sin g 4 to the left and angle of inclination of the pendulum with the vertical is tan 1 g
![8 A current of 6 A enters one corner Pof an equilateral triangle PQR having 3 wires of resistances 2 12 each and leaves by the corner R Then the currents I and I are a 2 A 4 A b 4 A 2 A c 1 A 2 A d 2 A 3 A 20 76A ww 252](https://media.kunduz.com/media/sug-question-candidate/20210612032203312989-2662149.jpg?w=256)
Physics
Basic Physics8 A current of 6 A enters one corner Pof an equilateral triangle PQR having 3 wires of resistances 2 12 each and leaves by the corner R Then the currents I and I are a 2 A 4 A b 4 A 2 A c 1 A 2 A d 2 A 3 A 20 76A ww 252
![Two 2 0 cm diameter insulating spheres have a 6 00 cm space between them One sphere is charged to 57 0 nC the other to 41 0 nC What is the electric field strength at the midpoint between the two spheres](https://media.kunduz.com/media/sug-question-candidate/20210418074140320457-2778328.jpg?w=256)
Physics
Basic PhysicsTwo 2 0 cm diameter insulating spheres have a 6 00 cm space between them One sphere is charged to 57 0 nC the other to 41 0 nC What is the electric field strength at the midpoint between the two spheres
![If temperature area changed by a factor of changes by a factor 8 of a body is increased by a factor of 2 and 113 2 4 then the power radiated](https://media.kunduz.com/media/sug-question-candidate/20210620162208287599-3396548.jpg?w=256)
Physics
Basic PhysicsIf temperature area changed by a factor of changes by a factor 8 of a body is increased by a factor of 2 and 113 2 4 then the power radiated