Physics Questions

In Young s double slit experiment if the source of light changes from orange to blue then 1 the central bright fringe will become a dark fringe mathongo 2 the distance between consecutive fringes will decrease mathong 3 the distance between consecutive fringes will increase 4 the intensity of the minima will increase athongo mathongs mathongs matho mathongo mathor mathongo mathongos

Since Pseudo Force acts opposite to the acceleration of non intertial frame then why don t centrifugal acceleration acts opposite to net acceleration Resultant of Tangentic acceleration and

Blocks of mass M and M are connected by a cord which passes over the pulleys P and P2 as shown in the figure If there is no friction the acceleration of the block of mass M will be O M 9 4M M M LABEL178 M P 4

Four resistances are connected by an ideal battery of emf 50 volt circuit is in steady state then the current in wire AB is 1 12 192 www www 302 A B 202 www 3 402 57 X Vp 312 412 413 50 6i3 413 5 1013 St 3x3 13

Find the forces in the hinged rods BC and AC if AB 60 cm AC 1 2 m BC 1 6 m see figure Hanging mass has a mass of 50 kg the mass of the rods can be neglected C is hinge A B A AC is in tension with force of 1000 N 4000 B AC is in tension with force of N 3 4000 C BC is in compression with force of N 3 D BC is in compression with force of 400 N C

Select the incorrect relation Where symbols haw their usual meanings 1 Cp YR Y 1 3 AU PV PV 1 Y www a non 2 Cp Cv R R Y 1 depend

3 Consider two point masses m and 2m at a distance of 3 m in a gravity free space Find the maximum possible velocity vo which can be given to 2m so that 2m and m revolve in a close orbit due to their mutual gravitational force c attraction 1 4Gm 3 2 Gm 3 2Gm

In the circuit shown in the figure the symbols have their usual meaning only one of the three switches is kept closed and other two are open during the entire experiment The value of resistance is R 20 2 When the angular frequency o of the 100 V source is adjusted to 500 rad s 1000 rad s and 2000 rad s it was found that the current was 4A 5A and 4A respectively R www A The switch that was closed is S B The switch that was closed is S C The value of L is 10 mH D The value of C is 100 F S S21 S3 100 V L C 16 roooo mm C L

Q10 A ball is thrown vertically upwards with a certain velocity While moving upwards it passes a point A at t second and then reaches the ground at 12 second The height of point A above the point of projection is Options 8 1 1 118712 gtit

What is angle between equipotential surface and electric field Write equation for potential energy of electrical dipole in vector form Define dielectric constant in terms of capacitance What is formula for capacitance of parallel plate capacitor What are factors on which capacitance of parallel plate air capacitor depends Which combination should be used to increase equivalent capacitance Dielectric constant of a medium is 5 find relative permittivity of the medium A capacitor of 2uF is charge up to 200 volts What is energy stored in it Two capacitors of same capacitance give equivalent capacitance C 2 in series What valent capacitance in parallel Charges q and 2q are enclosed by a surface What is total flux passing from the surface Charges each q are kept at points a 0 and 0 a find electric fields at origin If intensity of electric field in axial position is E what would be electric field at this point if dipc uatorial position

A particle of mass 200 g executes SHM The restoring force is provided by spring of spring constant 80 N m What is magnitude of acceleration when mass is 2 cm away from equilibrium position 4ms 2 6ms 8ms 2 10 ms

When water freezes it expands about nine percent What would be the pressure increase inside your automobile engine block assumed to be rigid if the water in there froze The bulk modulus of ice is 2 0x109 Pa and 1 atm 1 0 105 Pa 18 atm 3 1800 atm C 1080 atm 5 270 atm

13 A second pendulum is moved to moon where acceleration due to gravity is times that of the Earth the le of the Seconds pendulum on Moon would be 1 6 times 2 12 times 3 times 12 times

A diver takes off at 200 from vertical with a velocity of 10 m s The diving board is 2 m above the water surface and the diver s center of mass at take off was 1 2 m above the board Calculate 1 The maximum height above water achieved by the diver s center of mass 2 How long the center of mass of the diver is in the air PREPARATORY TAKE OFF Page Extra Credit Opportunity In groups of 2 or 3 include your names and answers to the following on a piece of paper and submit as you leave 2 pts ENTRY 49 of 49 A diver takes off at 20 from vertical with a velocity of 10 m s The diving board is 2 m above the water surface and the diver s center of mass at take off was 1 2 m above the board Calculate 1 The maximum height above water achieved by the diver s center of mass 2 How long the center of mass of the diver is in the air ZOOM

The galavanometer consists of a coil with 10 te many turns wound on a cylinderical soft iron core When a current flows through the coil a torque acts on it This torque is given by t NIAB The magnetic torque NIAB tends to rotate the coil by angle o A spring provides a counter torque ko that balances the magnetic torque The current sensitivity of the galvanometer is the deflection per unit current Statement 1 Two galvanometers with identical construction but one with core of greater permeability will have lesser current sensitivity Statement 2 Greater is the permeability of iron core greater is magnetic field 1 Statement I is true Statement II is true Statement II is the correct explanation of Statement I 2 Statement I is true Statement II is true Statement II is not the correct explanation of Statement I 3 Statement I is true Statement II is false 1 Statement I is false Statement II is true NIABUS al R 13 2 1 NIA fun 2 3 4 fur

cut each double heli ugar phosph predictably sequences th c That is t dentical bas pe of natur 1 A tuning fork is used to produce resonance in a glass tube The length of the air column in this tube can be adjusted by a variable piston At room temperature of 27 C two successive resonances are produced at 20 cm and 73 cm of column length If the frequency of the tuning fork is 320 Hz the velocity of sound in air at 27 is 1 330m s onito 2 339 m s 4 350 m s

In given figure the small block of mass 2 m is released from rest when the string is in horizontal position Smooth rod m 2gl 4 gl mg string Maximum possible velocity of ring of mass m is Assuming zero friction 2m fhm

velocities of different molecules cancel each other A At constant volume on increasing temperature the collision frequency increases R Collision frequency temperature of gas

Questions asked Prior to Medical Ent Exams 2005 27 The coefficients of linear expansion of brass and steel are a and a respectively When we take a brass rod of length 1 and steel rod of length 0 C then difference in their lengths 1 will remain the same at all temperatures if at 2 0 a

Q 1 Solve the following Draw a graph showing the variation of electron energy levels of Silicon as a function of its interatomic distance Explain from it why Silicon is a insulator at OK and semiconductor at RT

Pressure of an ideal gas depends on O Translational kinetic energy O Rotational kinetic energy O Vibrational kinetic energy None of these

Changing frequency of a Sonometer Wire A straight sonometer wire is stretched by the weight of a solid hanging block When oscillating the complete wire its oscillating frequency is n When block is immersed in water its frequency is n and when immersed in a liquid its frequency becomes n Find the specific gravity of block and tha of liquid

In an isolated parallel capacitance C the four surfaces have charges Q Q2 Q3 and Q4 as shown The potential difference between the plates is 1 2 3 Q Q Q3 Q4 2 Q Q3 2 Q Q3 2 Q Q3 Q4 71 al quay ditibul Q

Which of the given relations between the Boolean variables P and Q is NOT correct In the notation used here P denotes NOT P and Q denotes NOT Q a PO PQ P c PO P Q b PQ P Q d PQ Q P

Q 9 A point positive charge is brought near an isola conducting sphere in Figure The electric field is best given by 30 i ii E iv 9 9 MOJA 9 A Fig i C Fig ii Ans Option B is correct B Fig iii D Fig iv 99 A Explanation As given charge is q and lines of forces in positive charge must be outwards from positive charge q Now as the positive charge is kept near an isolated conducting sphere due to induction left part of sphere gets accumulated negative charge and right part gets positive and lines of force from right part of sphere must emerge outwards normally So verifies the answer B As lines of fo

A charged particle of mass m and charge q is released from rest in an electric field of constant magnitude E The kinetic energy of the particle after time t is 2E21 mg O E q 1 2m Eq m 21 o Eqm DI

alternate dark and bright bands 47 In an absorption an absorption spectrum dark lir corresponds to same wavelengths which w found in emission line spectrum of gas Ab statement is 1 correct for all gases 2 correct only for hydrogen like atoms 3 incorrect for all gases 4 incorrect except for hydrogen

Two inductors of self inductances L and L and of resistances R and R not shown here respectively are connected in the circuit as shown in figure At the instant t 0 key K is closed Choose the correct options for which the galvanometer will show zero deflection at all times after the key is closed A L R B L voor 42 voor R C R R4 www R R D R x R R x R

29 30 4 Streams of neutrons Cathode rays are streams of fast moving 29 farcir fari aftur negative charged particles Their speed range c 3 108 m s consider c 3 x 108 m s 1 0 1 c to 0 2 c 2 c 3 Greater than c 4 Around 10 c to 10 c Photoemission of electrons 30 1 0 1 c to 0 2 c 2 c 3 c 4 10 c to 10 c ll fuck ufc 94

sir i have read that gamma 1 2 f which is this formula and when to us e this one and when to use that on e what is difference Le C 3 R C 14 JR Y Note that C C R is true for any ideal gas whether mono di or polyatomic Table 13 1 summarises the theoretical predictions for specific heats of gases ignoring any vibrational modes of motion The values arr

1 A particle moving with velocity V is acted by three forces shown by the vector triangle PQR The velocity of the particle will NEET 2019 P R a Increase b Decrease e Remain constant d Change according to the smallest force QR Q

135 B Speed of A just after the impulse imparted is Speed of B just after the impulse imparted is Speed of just after the impulse imparted is Speed of A just after the impulse imparted is 23 7m V10J 7m 28 28 37 7m

A massive weekly conducting metal cylinder with closed bottom of height h 1 m closed on top by a moving piston contains an ideal gas On top of the piston we gently put some weight The piston immediately dropped by x 2 5 cm and over a long time it was seen that the piston comes down another x 1 cm Determine the degree of freedom for the molecules of the gas Room temperature is constant gas does not leak

The force time graph for a body of mass 2kg is shown If initialy the body moves with 2m s Find its velocity at the end of 2 seconds Answer 7 U 2m s At time 2sec F 10N M 2kg F M a a 10 2 5 Now acceleration 5 a v u t 5 v 2 2 v 12 but answer is seven I can solve this question through impulse or drwaing acceleration time graph but i want to ask that why first method i e which gave the answer 12 was wrong F 10N 2s T

What total energy is stored in the capacitors in the figure below C10 443 uF C 10 7 uF if 1 80 x 104 is stored in the 2 50 uF capaci three significant figures J 2 50 F

A boy shoves his stuffed toy zebra down a frictionless chute It starts at a height of 1 73 m above the bottom of the chute with an initial speed of 1 03 m s The toy animal emerges horizontally from the bottom of the chute and continues sliding along a horizontal surface with a coefficient of kinetic friction of 0 293 How far from the bottom of the chute does the toy zebra come to rest Assume g 9 81 m s

Kinetic Theory 47 16 If heat energy is given to an ideal gas at constan pressure then select the graph which bes represents the variation of VT with temperature 7 VT 3 L VT T 2 T

In Young s double slit experiment the distance between the slits is reduced to half and the distance between the slit and screen is doubled then the fringe width O Will not change O O Will become half Will be double Will become four times

15 In Young s double slit experiment using a source of light of wavelength 5000 the fringe width is 0 6 mm If the distance between the screen and the slit is reduced to half then what should be the wavelength of light used to get fringes 0 4 mm wide 3 33 x 10 6 cm Pro 6 66 x 10 6 cm 33 3 x 10 6 cm 66 6 x 10 6 cm B D

In an electrical circuit potential difference V 8 0 0 8 V and current 2 0 0 2 A The value of resistance R with error limits is 4 0 1 Q 4 0 0 8 0 4 0 0 2 Q Read More 40 06 0

A uniform solid cylinder of mass M and radius R rolling without sliding on a rough horizontal plane is pulled at its axis with a horizontal velocity of Vo By means of a string of length 2R attached to its axis the cylinder is dragging a thin plate of mass m 2M lying on the plane If the pulling force is removed and the coefficient of friction between the cylinder and ground is sufficient enough for rolling always u 0 4 Vo 2m sec R 0 5 m g 10 m sec Choose the CORRECT option s before the cylinder comes to rest M G 2R X H A The net force on the cylinder is along positive y direction

PHYSICS AB and CD are two uniform resistance wires of lengths 100 cm and 80 cm respectively The connections are shown in the figure The cell of emf 5 V is ideal while the other cell of emf E has internal resistance 2 2 A length of 20 cm of wire CD is balanced by 40 cm of wire AB Find the em E in volt if the reading of the ideal ammeter is 2 A The other connecting wires have negligibl resistance AL Ca 5V 41 40 cm 20 cm www F 2 0 B D A Ammeter ideal

In the given circuit current through the zener diode is 30 mA 24 mA 36 mA 9V V 6V wwwww 10002 wwww 1k02

4 Cannot be calculated unless value of C is not given 4 In an L R circuit AC source of frequency 50 Hz is connected as shown in the figure The phase differenc between voltage and current is www R 157Q L 1 H 2 3 momo

mass connected to a string which is attached to a vertical post If the mass is released when the string is horizontal as shown the magnitude of the total acceleration of the mass as a function of the angle 0 is 1 g sin 0 3 g 3 cos 0 1 0 U 2 g cos 0 4 g 3 sin 0 1

25 According to C E van der Waal the interatomic potential varies with the average interatomic distance R as 1 R 1 3 RA 2 R2 4 R

SolveLancer Test The middle terms in the expansion of 4a respectively are SolveLancer Test 31 31 a C 6 27 C16 31 31 b 1 C 7 27 1 C 7 31 C15 31 14 c C 5 27 G 5 27 d 31 C16 214 31 C16 216 1 2a 3

A capacitor of capacitance 1uF is discharging through a resistance Initial potential difference across capacitor is 12V At t 1 10 s potential difference across capacitor becomes 6V Find value of resistance R 1 1 443 x 104 3 1 443 x 105 Q 2 2 886 x 105 Q 4 1 443 x 106

A man start running along straight road with uniform velocity u observes that the rain is falling vertically downward If he doubled his speed he finds that the rain is coming at an angle 0 to the vertical the velocity of rain with respect to the ground A ui u tanj B ui u cot j C ui ucot j D tan 0 i uj

Two blocks with masses M and M are connected by a massless string that passes over a massless pulley as shown M has a mass of 2 25 kg and is on an incline of 45 5 with coefficient of kinetic friction 0 205 M has a mass of 6 95 kg and is on an incline of 02 34 5 with coefficient of kinetic friction 0 105 The two block system is in motion with the block of mass M sliding down the ramp Find the magnitude a2 of the acceleration of M down the incline a m s M 0 M 12 M Figure is not to scal