Physics Questions

6 82 A massive body moving radially from a planet of mass M when at distance r from planet explodes in such a way that two of its many fragments move in mutually perpendicular circular orbits around planet Find the maximum distance between fragments before collision and their relative speed at the moment they collide 6 GM

An electric dipole consist of two opposite 18 charges each of magnitude 1 C separated by a distance of 2 cm The dipole is placed in an external field of 10 N C The maximum torque that could act on dipole is 1 0 5 102 N m 2 1 102 N m 3 2 102 N m 4 3 10 N m gaya fake fa faa 1 C 2cm af 10 N C 7 X HUBJT I5I THU A B C D I 1 0 5 102 N m 2 1 102 N m 3 2 10 N m 3 x 10 N m ionpaper

In a standard YDSE set up a slab of thickness t refractive index is placed in front of the upper slit Other symbols have usual meaning 1 11 III IV 1 Column 1 2 D 3 D D D 10 3 2 x 10 3 5 x 10 4 4 x 10 3 1 i P i II ii Q ii III iii R iii iv Column 2 t 1 m 1 6 t 1 5 m 1 3 t 2 m 1 6 If the intensity at central maxima is lo in which of the following case intensity at the centre of the screen is zero t 2 5 m 1 4 Question Type Single Correct Type Column 3 P 400 nm Q X 500 nm R 600 nm S 700 nm

Electric field intensity at centre of semicircular 16 gada are as shown in fig is 82 1 10 10R 2 10 22 3 k 4 5 2 OR Telegram an Brit 1 10 2 10 2 k 3 5 R Szk R 4 5 2 82 OR 6

a Liquid oxygen at 50K is heated to 300K at constant pressure of 1 atm The rate of heating is constant Which one of the following graphs represents the variation of temperature with time c Time 2 Time KR d Time 170 Time From NCERT NEET 201

In the circuit of adjoining figure the current 32 through 1202 resister will be 1 1 A 2 502 www SV ww 1202 3 SQ F ZA 4 0 A The currant in racistance R in the given circuit ram ne questionpaper je 22 AE 120 Perf www 1202 1 1A 2 A 3 A 502 CF A 4 0 A

11 Two coherent sources of different intensities send waves which interfere The ratio of maximum intensity to the minimum intensity is 25 The intensities of the sources are in the ratio 1 25 1 3 9 4 2 5 1 4 625 1

2 13 The dispersive powers of flint glass and crown glass are 0 053 and 0 034 respectively and their mean refractive indices are 1 68 and 1 53 for white light Calculate the angle of the flint glass prism required to form an achromatic combination with a crown glass prism of refracting angle 4 1 2 2 4 3 5 4 6

The graph shown below shows variation of de Broglie 1 wavelength A versus where Vis accelerating potential for three charged particles of equal charges but different masses 2 B O MA MB mc MB mc mA MA mc mB A 1 V

52 As shown in figure if capacitor of capacitance C is charged by connecting it with a resistance R then energy given by battery will be fay my fagur af cuka a ya ufadu ma C 1 12 CV 1 CV 2 Less than 2 CV 2 CV 354 www R 3 CV 3 CV GR 4 More than CV 4 CV 3h

If temperature is increased from 27 C to 127 C what is ratio of de Broglie wavelength of wave associated with a material particle at these two temperature 1 155 1 92 2 665

A solid cylindrical aluminum conductor 25 km long has an area of 336 400 circular mils Obtain the DC conductor resistance at a 20 C and b 50 C The resistivity of aluminum at 20 C is 2 8 x 10 8 Q m and T 228 L 25 x10 m2 P 2 8x1082L m

O 15 cm A concave mirror is moving with velocity 41 21 cm s whereas a point object is moving with 8i 11j cms as shown in figure The object is at a distance of 15 cm in front of mirror whose focal length is 10 cm The axial velocity of image is v then 4xn find the value of n

6 For a cell terminal P D is 2 2V when circuit is 26 open and reduces to 1 8V when cell is connected to a resistance of R 502 Determine internal resistance of cell r 1 2 3 2 2 fall 1 8V fat r 1 2 3 0 2 2V 5 ta R 2 59

V A m 2qB X XXX X X X X X X X 2B W X X B X XXX X B K W if v is the velocity just required for a charge particle of mass m and charge q to pass through the magnetic field Particle is projected with velocity v then how much time does such a charge spend in the magnetic field of the two magnetic fields Tm qB C 7m 4qB basga fab D 3 m 2qB

A conducting loop slides on a horizontal frictionless table into a square region of uniform magnetic field as shown Which graph is the most appropriate option showing the speed v of the loop as a func tion of time t V 1 VI t 2 V V t

The energy difference between first excited state and ground state of a given system is 1 96 eV The transition occurs between first excited state and ground state Given K 8 6 X 10 5 eV K or 1 38 X 10 power 23 J K The ratio of poulation of excited versus ground state at 27 degree celsius is OPTIONS 0 326x10 31 0 56 10 31 1 1 10 33

A particle with mass 1 0 mg having charge 2 0 C move under the action of a uniform electric field of 21 31 N C If the velocity of the particle at t 0 is 1 2 m s its velocity at t 2 s will be O 8i 12 m s O 9i 10 m s O 81 12 m s 6i 8j m s

The scale of a galvanometer is divided into 150 equal divisions The galvanometer has the current sensitivity of 10 divisions per mA and voltage sensitivity of 2 5 divisions per mV Find value of Shunt S to be connected to convert into Ammeter of range 0 6 A Only one correct answer A 0 10 2 B 0 04 0 C D 16 Q 0 01 Q

Under normal operating conditions the gate terminal of an n channel junction field effect transistor JFET and an channel metal oxide semiconductor field effect transistor MOSFET are a both biased with positive potentials b both biased with negative potentials c biased with positive and negative potentials respectively d biased with negative and positive potentials respectively

The maximum and minimum magnitudes of resultant of two vectors are 12 units and 6 u respectively Then the magnitudes of two vectors will be A 8 units 4 units B 10 units 4 units C 9 units 3 units D 7 units 5 units

32 During 2A B Run the kinetic study of the reaction C D following results were obtained 4 in M B in M Initial rate of formation of 1 D in Ms S I 0 1 0 1 II 0 3 0 2 III 0 3 0 4 IV 0 4 0 1 On the basis of above data which one is correct 6 0 10 7 2 10 2 88 10 2 40 10

Two blocks of mass 6 kg and 4 kg are connected by a string as shown Acceleration of both blocks when F 100 N is applied on the pulley 6 kg 1 0 0 3 0 15 m s F 4 kg 2 0 2 5 m s 4 6 m s 15 m s

A current 1 flows along a triangular loop having sides of equal length a The strength of magnetic field at the centre of the loop is A B 3 I 2 a Your Answer 9 0I 2 Correct Answer

1 Highly energetic electrons are bombarded on a target of an element containing 30 neutrons The ratio of radii of nucleus to that of Helium nucleus is 14 3 The atomic number of nucleus will be fach i saci 1 25 2 26 1 3 3 56 4 30 well

parallel plate capacitor has capacitance 5 50 F a How much energy is stored in the capacitor if it is connected to a 15 00 V battery 10 b If the battery is disconnected and the distance between the charged plates doubled what is the energy stored A c The battery is subsequently reattached to the capacitor but the plate separation remains as in part b How much energy is stored 10

50 Velocity of sound waves in air is 330 m sec For a particular sound in air a path difference of 40 cm is equivalent to a phase difference of 1 6 The frequency of this wave is af 330 m sec 40 cm 1 6 CR 1 165 Hz 2 150 Hz 3 660 Hz 4 330 Hz

The refractive index of material of plano convex lens if the radius of curvature of convex lens is 20 cm and focal length is 60 cm will be wich 43 1 2

STATEMENT 1 A body is lying at rest on a rough horizontal surface A person accelerating with acceleration al where a is positive constant and i is a unit vector in horizontal direction observes the body With respect to him the block experiences a kinetic friction STATEMENT 2 Whenever there is relative motion between two rough contact surfaces then kinetic friction acts A Statement 1 is True Statement 2 is True Statement 2 is a correct explanation for Statement 1 B Statement 1 is True Statement 2 is True Statement 2 is NOT a correct explanation for Statement 1 C Statement 1 is True Statement 2 is False D Statement 1 is False Statement 2 is True

The nucleus of the atom Be consists of a 13 up quarks and 13 down quarks c 14 up quarks and 13 down quarks Which one of the following nuclear reactions is possible b 13 up quarks and 14 down quarks d 14 up quarks and 14 down quarks

ected with 2gR from the lowermost point of smooth vertical circular track of radius R as shown Then C B A 1 Particle complete circular path 2 Particle will leave the track between points and C 3 Particle starts oscillation about point A 4 Depends on mass of the particle

48 When ordinary light of intensity 100 unit is incident on a polariser The output intensity will be Caffarell Gidl Gafah S100 at faria aldi ari 3 75 2 50 4 100 1 25 19 A hodu is performing simple harmonic motion with amplitude a and time period T Variation of its

There are two concentric conducting spherical shells of radius R and 2R respectively Inner shell is given charge Q and outer shell is neutral If both shells are connected by conducting wire then heat loss is Only one correct answer A B C Q 8TER 16TER Q 4TEOR

17 The two ends of an inextensible string of length I and mass M are fastened together on a circular loop and set spinning about the centre of the circle with uniform angular velocity o The tension in the string is a Mw 1 b Mw 1 2 c Mw Mw 1 47 d

Two metal spheres of radii a and b are connected by a conducting wire Their separation is very large as compared to their dimensions The capacitance of this system is Only one correct answer A B C 4 E0 ab 2 a b 4 a b ab i

A uniform stick of mass 18 kg and length 3 m spins around on a frictionless horizontal plane with its Centre of Mass stationary A mass M is placed on the plane and the stick collides elastically with it as shown with the contact point being the end of the stick What should M in kg be so that after the collision the stick has translational motion but no rotational motion l M

30 A dip circle is taken to geomagnetic equator The needle is allowed to move in vertical plane perpendicular to magnetic meridian The needle will stay In horizontal plane only 2 In vertical direction only 3 In any direction except vertical 4 In any direction it is released component dieulor of externa

5 The first law of thermodynamics is concerned with the 1 Conservation of momentum 3 Conservation of mass 1 3 2 Conservation of energy 4 Conservation of temperature 2 f 4

A circuit is connected as shown in the figure with the switch Sopen When the switch is closed the total amount of charge that flows across Sis A O Only one correct answer B 54 pC 3 F HH C 27 C 302 9V 6 F 60 www G

7 50 g ice at 0 C is dropped into a calorimeter containing 100 g water at 30 C If thermal capacity of calorimeter is zero then amount of ice left in the mixture at equilibrium is 50 g 100 g 1 12 5 g 2 25 g 3 20 g 30 C f 4 10 g

Electromagnetic radiations of intensity 1 W m strikes on the surface of a substance which reflect 80 incident radiation back into same medium The radiation pressure on the surface of substance is Only one correct answer A 4 10 8 N m B 2 5 10 7 N m C D 8 10 8 N m 6x 10 9 N m i

Identify the correct relation for the given diagram for frequency K V03 V02 V01 V1 V2 V3 V2 V3 V1 V3 V2 V1 V1 V2 V3 O anode potential

The potential difference across the inductor when it is co nnected to battery is only the induced EMF Right why do we not consider the potential drop developed across induc tor due to connection with positive and negative terminal of battery as we do it in case of resistor connected to batt ery

6 A ball is projected upward then it is at same height of 80m at 8s and 10 s What will be its projecti velocity a 1 9 m s e fu fall 2 180 m s 10 3 90 m s 4 45 m s

R R C C 3 2 points Consider the circuit shown in Figure le The battery has an EMF of 60 0 V and negligible internal resistance R2 2 002 C 3 00F and C2 6 00 F After the capacitors have reached their final charges the charge on C1 18 02C a What is the final chargo on C22 b What is the value of

Illustration 3 117 Consider an ellipse having its foci at A z and B 2 in the Argand plane If the eccentricity of the ellipse be e and it is known that origin is an interior point of the ellipse then prove that 131 3 1

Briefly explain the following instructions and indicate the operand no of bytes taken no of machine cycles with proper explanation like Fetch Read Write and no of T states in each machine cycle 4 a XTHL b CALL unconditional c RESTART d JUMP unconditional e RET

Which of the following is true when a dipole is placed in non uniform and increasing electric field Only one correct answer A Net force on it is always equal to zero B Torque can not be zero C Torque must be zero

3 3 4 4 12 1 The escape velocity on a planet with radius 41 double that of earth and mean density equal to that of earth will be escape velocity on earth 11 2 km sec 1 11 2 km sec 3 5 5 km sec 2 22 4 km sec 4 15 5 km sec 3 3 4 4 12 1 e fu fatal geat of front of gr arier am af at a yell 11 2 km sec 1 11 2 km sec 3 5 5 km sec 2 22 4 km sec 4 15 5 km sec

2 Light of wavelength 5000 is incident normally on a plane transmission grating Find the difference in deviations in the first and third order spectra The number of lines per cm on the grating surface is 6000