Physics Questions

Two protons each of mass m and charge e are held at rest at distance 1 m apart in air The maximum velocity acquired by each proton after release is k 3 1 4 O e 2k m k 2 e 4 k m 2k

In an ammeter 10 of the main current is passing through galvanometer if the galvanometer is shunted with a 102 resistance The resistance of the galvanometer is 1 2012 2 5022 3 90 2 4 100 OD abwoon

A direct current of 5A is superposed on an alternating current I 10 sin oot flowing through the wire The effective value of the resulting current will be 2015 a 15 2 A c 5 5A 5 3A b d 15 A

A parallel plate capacitor have plate area A and plate separation d is charged by a battery of voltage V The battery is then disconnected The work needed to pul the plates to separation 2d is O AV d 2AV 0 d Read More O AV 0 2d

A particle having charge q and mass m is projecte with velocity v 27 31 in uniform electric fiel E E Magnitude of change in momentur during time interval tis 1 13mt Eo 2 qEot m

Question 3 A block of mass 3m is suspended by a meter scale rod of mass m as shown in figure If the tension in string A is equal to kmg in equilibrium then value of k will be A 25 50 1 2 3 4 54 5 315 n 75 100 cm 3m

This section contains 35 SINGLE COR 20 Q An AC circuit has an inductive reactance equal to 10 Q and a resistance of 100 The effective impedance of the circuit is O 10 2 22 Read More O 10 3 2 questions Each question has 4

A projectile is thrown with velocity v making an angle 0 with the horizontal It just crosses the tops of two poles each of height h after 1 second and 3 second respectively The time of flight of the projectile is A 1 s B 3 s D 7 8 s C 4 s

For the system shown in figure the pulleys 130 are light and frictionless The tension in the string will be 0 m 2 A mgsine C 2mgsin0 3 B mgsin0 1 D mgsin0 2 m 131 132

This section contains 15 SINGLE CORRECT TYPE quest Read More A ideal gas taken through the cycle ABCA as shown in PV diagram The work done during the cycle is B 2P 2V A PV O PV O PV 2 O2PV C P 2V V

A force of 10 N stretches a spring 0 2 m A 250 g mass attached to this spring is vibrated from a position 10 cm below the equilibrium position with an initial velocity of 0 2 m s upwards Find the equation of motion

A and B are two radioactive substances whose 12 half lives are 1 and 2 years respectively Initially 10 gm of A and 1 gm of B is taken The time approximate after which they will have same quantity remaining is A 6 62 years C 2 years B 1 year D 100 years

When two waves with same frequency and constant phase difference interfere A there is a gain of energy B there is a loss of energy C the energy is redistributed and the distribution changes with time D the energy is redistributed and the distribution roma ant in timo 135

11 For a ballistic pendulum if the length L 1 9 meter angle of deflection from vertical 0 17 4 degree the mass of the bullet m 27 gram and the mass of the catcher M 591 gram the velocity m s of the bullet is

b If the clock is started at 12 00 noon what will it read after a time of 21 8 h has elapsed on Earth Enter the time to the nearest minute Enter a number the clock run on the Moon X Knowing that the clock is designed to advance by 1 0 s for every oscillation and knowing the actual time elapse for one oscillation how can we determine the total time elapse and the reading on the clock PM

10 Two carts of masses m 3 174 kg and m 7 454 kg undergo an elastic collision Before the collision while the second cart is stationary the velocity of the first cart is v 5 73 If the final velocity after collision of the second cart is v 2 0 96 m s the final velocity m s of the first cart is

n a meter bridge a standard resistor R ohm is connected in left gap and two dentical wires A and B are connected one after the other in right gap The balancing length measured from left gap is 50 cm If two wires are connected in parallel and put in right gap the balancing length measured from left gap would De in cm 25 Read More 60

Two isolated spherical conductors have radii 5 cm and 10 cm respectively They have charges of 12 C and 3 C Find the charge of bigger sphere after they are connected by a conducting wire A 6 C B 3 C D 4 C C 9 C

A ball of mass m is dropped from height h on a light platform fixed at the top of vertical spring as shown in the figure The platform is depressed by a distance x What is the spring constant A C me 2mgh x 2mg h x 1000 KEN B 2mgh x D 2mg h x

A current i 3 36 1 2t x 10 2 A increase at a steady rate in a loop straight wire A very small circular loop of radius 10 3 m has its plane parallel to the wire and is placed at a distance of 1m of wire The induced emf in loop is A 134 4 X 10 15 V B 13 44 T X 10 15 V C 1 344 x 10 15 V D 0 1344 x 10 15 V 1m

A block A of mass m is given a velocity vo towards another block B of same mass B is attached to an ideal spring of spring constant K A makes a head on perfectly inelastic collision with B Choose the correct option s K momm B m Smooth Vo LA m Time after the collision B attains its initial position again m for the second time is R 2 1 Time after the collision B attains its initial position again 2m for the second time is K

A neutron a proton an electron and an a particle enter in a region of constant magnetic field with equal velocities The tracks of the particles are shown in figure Relates the tracks to the particles X X X B A X P C X X X X X X D A C neutron D a particle A electron B proton B C neutron D electron A a particle B proton C C neutron D electron A proton B a particle D None

5 A body of mass m at rest breaks into three parts due to some explosion with masses in the ratio1 3 3 The two parts with same mass move in mutually perpendicular directions with a velocity of 15 m s The velocity of the remaining part will be A 5 m s B 45 2 m s C 5 32 m s D zero

2 An unpolarised beam of light is incident on a group of four polarising sheets which are arranged in such a way that the characteristic direction of each polarising sheet makes an angle of 30 with that of the preceding sheet The percentage of incident light transmitted by the first polariser will be a 100 OS b 50 c 25 d 125

105 In given circuit the power consumed in 120 16 resistor is W then the power consumed in 3 49 resistan is A 64 3 W 16 85 www 452 ww 120 ww 120 B 64 9 16 W W

04 If wind is blowing from source side to observer side what will be effect occur on the difference between apparant freq to original freq during relative motion between source and observer A Decreases B Increases C Remain constant D Can t say

09 There are two radio nuclie A and B A is an alpha emitter and B is a beta emitter Their distintegration constants are in the ratio of 1 2 What should be the ratio of number of atoms of two at time t 0 so that probabilities of getting a and particles are same at time t 0 A 2 1 C e B 1 2 D e

2 28 A wedge of mass M 2 m rests on a smooth horizontal plane A small block of mass mo rests over it at left end A as shown in figure A sharp impulse is applied on the block due to which it starts moving to the right with velocity vo 6 m s At highest point of its trajectory the block collides with a particle of same mass mo moving vertically downwards with velocity v 2 m s and gets stuck with it If the combined mass lands at the end point A of the body of mass M length is cm Neglect friction take g 10 m s mo B 20 cm

Two springs both have spring constant k and relaxed length zero They are each stretched to a length and then attached to two identical masses 1 and 2 and a wall as shown in figure The masses ar simultaneously released Immediately afterwards the magnitudes of the accelerations of 2 k fecer l A mass 1 is C mass 2 is 1 m k sellele l kl m 2kl m m B mass 1 is zero D mass 2 is kl m

The insulating property of air breaks down at the intensity of electric field 3 x 106 V m The maximum charge that can be given to a sphere of diameter 5 m is about O 2x 10 5C 2x 10 C Read More O 4 x 10 6 C

132 For shown charge system B q a Aq a a C q the electric field is A Non zero everywhere B Zero everywhere C Zero at midpoint of BC D Zero at centre of triangle ABC

Give reasons 4 Ozone layer is a protective shell of earth Microbes in soil get distroyed 2 Answer the following questions 3 Explain with help of diagram how soil is formed Write difference between Living and non living thing Plants and animals

The electric field due to an electric dipole at a distance r from its centre in axial position is E If the dipole is rotated through an angle of 90 about its perpendicular axis the magnitude of electric field at the same point will be A E C E 2 B E 4 D 2E

13 A coil having n turns and area A is initially placed with its plane normal to the magnetic field B It is then rotated through 1800 in 0 2 sec The emf induced at the ends of the coils is A 0 1 nAB C 5 nAB B nAB D 10 nAB 120

12 If the density of material of a square plate and a circular plate shown in fig is same the centre of mass of the composite system 1 will be A inside the square plane B inside the circular plane C at the point of contact D outside the system D Kel

A common emitter amplifier is designed with n p n transistor a 0 99 The input resistance is 1KQ and load is 10 KQ the voltage gain will be A 99 C 9 9 B 990 D 0 99

A ball released from the top of a tower travels 11 36 of the height of the tower in the last second of its journey The height of the tower is Take g 10 ms 2 A 11 m C 47 m B 36 m D 180 m

3 45 Q 187 In the given circuit 4 A steady current enters int the network The charge stored on plate B of the capacitor is 4 A 1 8 C 3 16 C wwww 39 X www 592 www 522 A 4 F TB I Y wwww 39 4 A 2 8 C 4 16 C 1 CV 3 CV 192 When batter conductor AB conductor is battery of em electrons will

126 The relative density of the material of a body is the ratio of its weight in air and the loss of its weight in water By using a spring balance the weight of the body in air is measured to be 5 000 05 N The weight of the body in water is measured be to 4 00 0 05 N Then the maximum possible percentage error in relative density is A 11 C 9 B 10 D 7 1

103 How do velocity of a charge particle moving 10 in a circle depends on the radius of the circle if the field is a magnetic b electric A a vor b v o 1 Tr B a vx b v x r C a v x b vxr Tr D a v or b v c

28 A wedge of mass M 2 m rests on a smooth horizontal plane A small block of mass mo rests over it at left end A as shown in figure A sharp impulse is applied on the block due to which it starts moving to the right with velocity v 6 m s At highest point of its trajectory the block collides with a particle of same mass mo moving vertically downwards with velocity v 2 m s and gets stuck with it If the combined mass lands at the end point A of the body of mass M the length is cm Neglect friction take g 10 m s B 1 0 20 cm

Two monoatomic ideal gases A and B of molecular masses m and respectively are enclosed in separate containers kept at the same temperature The ratio of the speed of sound in gas A to that in gas B is given by

A rocket is fired upwards Its engine explodes fully in 12 second The height reached by the rocket as calculated from its velocity time graph is A 1200 x 66 m B 1200 x 132 m 1200 C 12 D 1200 x 122 m m 1200 v ms 12 t in second 132 98

A spool of mass M inner radius R and outer radius 2R MR having moment of inertia 2 sliding on a rough horizontal surface by the help of an applied force on ideal string wrapped around the inner cylinder as shown in the figure Minimum co efficient of friction required between spool and floor for rolling without X sliding will be Value of x is 9 is made to roll without F Mg

If de broglie wavelength of a particle is 2 then calculate de broglie wavelength of He on accelerating across same potentia difference A 2 2 C 22 B 2x D

4 If the energy released in the fission of one nucleus is 200MeV Then the number of nuclei required per second in a power plant of 16KW will be A 0 5 x 1014 C 5 x 1012 B 0 5 x 1012 D 5 x 1014

This section contains 35 SINGLE CORRE YPE questions Each question has 4 Read More The current in the part of electric circuit is 1 A 2A 12A 01 A O 1 7 A O 2 5 A R 1 1 3 A

A particle having charge q and mass mis projected with velocity v 21 3j in uniform electric field Ej Magnitude of change in momentum during time interval t is 13mt Eo 43 qEot m qEot Zero

1 A simple harmonic motion having an amplitude A and time period T is represented by the equation y 5 sin t 4 m Then the values of A in m and T in sec are A A 5 T 2 T B A 10 T 1 ID 10 T 2

Force acting on a particle moving in the x y plane is F y i x N x and Yare in metre As shown in Fig the particle moves from the origin O to point A 6m 6m The figure shows three paths OLA OMA and OA for the motion of the particle from O to A Y A 6 m 6 m A L Along which of the three paths is the work done maximum M OA OMA OLA X