Physics Questions

ng 1 h g A stone is dropped from a certain height and another stone is dropped from the same height after 2s Wha will be their separation after 10 more seconds 1 115 6 m 2 156 5 m 3 172 3 m 4 215 6 m de if gravity disappears find the total time it would

12 In resonance tube experiment we use Oa transverse progressive waves Ob longitudinal progressive waves O c longitudinal stationary waves Od transverse stationary waves

A fighter plane is yung horizontally at an altitude of 1 5 km with speed 720 km h At what angle of sight w r t horizontal when the target is seen should the pilot drop the bomb in order to attack the target Take g 10 ms2 tan23 0 43 O O O O 23 32 12 42

11 A stone weighing 3 kg falls from the top of a tower 100 m high and buries itself 2 m deep in the sand The time of penetration is 12 ant 2 0 9 sec 1 0 09 sec 3 2 1 sec The velocity of a body at any instant is 10 m s Aftor 5 acceleration is 4 none of these 4 1 3 sec

A body performs linear S H M with amplitude a When it is at a distance from 3 extreme position the magnitude of velocity is times the magnitude of acceleration The period of S H M is 3 2 5 A B C D 5T 3 5 2 T 3 5 TT S S S S

Example 2 A car is moving along a straight line OP It moves from 0 to P in 18 seconds and returns from P to Q in 6 seconds where OP 360 m and OQ 240 m What are the average velocity and average speed of the car in going a from O to P and b from O to P and back to Q EVA 6

E 2n Hb 1 4R L 3 3R x a a In 3 2n For the given R L circuit the time constant is R www 4 www 2R reee L 2 T 2 a 2T 2R 4 R 3L 4R 3 x L R tu For the given R L circuits the current through the cell just after switch is closed volt 3 2 volt 4 2 2 volt Two similar coaxial circular loops in the same direction On m apart the electric current will 1 Increase in both 2 Decrease in both 3 Remain unaltered 4 Increase in one and 23 Consider a thin metallic plane of the paper mov magnetic field B goin see fig If charge d on the left and righ sheet then Ignore

he slotting processes in a metallic sheet causes The increase of the resistance in the path for circulation of current 2 Decrease in the strength of eddy current 3 Feeble the electromagnetic damping AX All of these

28 A ball is dropped from height h and after striking with the ground it rises up to height h The coefficient of restitution between the ball and the ground is 1 3 h ho h Whe 2 4 h ho 2 ho

3 ALLEN Three blocks A B and C of masses 8 kg 4 kg 23 and 2 kg respectively are in contact on a frictionless surface as shown If a force of 28 N is applied on the 8 kg block then the contact force between A and B is A B 1 12 N 3 36 N C 2 16 N 4 4 N 8 kg 4 kg 2 kg 30 A B Caran 8 kg dupla uas uz uzuk B1 afe 28 N Trifa faxan Gua B 1 12 N 3 36 N A B C 2 16 N 4 4 N

The magnetic field of a plane electromagnetic wave is B 3 108 sin 2007 y ct i T where c 3 108 ms 1 is the speed of light The corresponding electric field is A E BE E C 10 6 sin 2007 y ct k V m 9 sin 2007 y ct V m E 9 sin 2007 y ct V m

In an astronomical telescope focal length of objective lens is 75 cm and that of eye piece is 5 cm What is magnifying power if final image is seen at 25 cm from eye 18 22 O 15

40 At t 0 observer and source are at same place Now the source is projected with velocity 60 2 m s at 45 Natural frequency of source is 1000 Hz Find the frequency heard by the observer at t 2 s Take speed of sound 340 m s a 930 Hz c 826 Hz b 860 Hz d 970 Hz

Figures below show regular hexagons with 19 charges at the vertices In which of the following cases the net electric force at the centre is not zero 1 qd 3 qo q bq 24 09 2 qd 4 go fax at 1 qo 3 qo faff 99 o f fun ga

53 From a circular disc of radius R and mass 9M a small disc of R radius is removed as shown 3 in figure The moment of inertia of the remaining disc about an axis perpendicular to the plane of the disc and passing through O is a 4 MR c 40 MR b d 40 9 37 R 3 RO MR MR2

9 In a resonance tube experiment tube has radius of 3 cm then its end correction is a 0 9 cm Ob 0 5 cm O c 0 9 m d 1 8 cm 1 point

A ray of light passing through equilateral triangular glass prism from air undergoes minimum deviation when angle of incidence is of angle of prism What 3 4 is refractive index of the prism O 2 1 61

Six point mass particles are is placed on horizontal surface such that arrangement form a regular hexagon as shown Calculate coordinate of center of mass of arrangement A 1 3 B 3 1 2 5m 1 0 0 4m A 2m 3m C 3 1 D 3 1

27 3 1 27 x 10 N 4 0 127 N A body A of mass m exerts a force on another 27 body B of mass m If the acceleration of B be a2 then the acceleration in magnitude of A is m2 mi 82 mi 3 82 m 2 m m a 4 m m a LEADER TEST SERIES JOINT PACKAGE COURSE HEET UG 2021 02082020 3 1 27 10 N 4 0 127 N A m o a arifi anti a 3 m mi m a2 82 Space for Rough Work ferg Gu B Ba a A 2 mm a 4 m m a 0999DMD310320003 LIS Page 9 48

P current carrying cable is penetrating a loop as shown in the figure If magnitude of current is decreasing with time then the current induced in the loop is C 1 Zero 2 Clockwise 3 Anticlockwise 4 Depends on the magnitude of current

22 The equation for the vibration of a string fixed at both ends vibrating in its third harmonic is given by y 2 cm sin 0 6 cm cos 500 ps t The length of the string is a 24 6 cm c 20 6 cm b 12 5 cm d 15 7cm

4 capacitors each of 2 F are connected as shown What will be the equivalent capacitance across the points A and B 1 Point A C1 C3 B C2 C4

A convex surface of radius of curvature 40 cm separates two medium of refractive indices and 4 3 1 50 An object is kept in the first medium at distance of 20 cm from the convex surface What is image position O 24 cm from pole 30 cm from pole O 18 cm from pole 36 cm from pole

A 61 000 kg Rocky Mountain Double big rig is traveling at 0 5 m s About what velocity must a 730 kg compact electric vehicle have to achieve the same amount of momentum as the Rocky Mountain Double OB 365 m s O A 42 m s C 91 m s D 4 6 m s Rocky Mountain Double Small electric car

A potential difference of 400 volt is applied across the plates of a parallel plate capacitor plates being separated by 2 mm An electron projected vertically upward parallel to the plates with a velocity of 4 x 10 6m s moves undeflected between the plates The magnetic field in the region between the plates is 1 Point I

1 Three uncharged capacitors of capacitance C C 11 and C are connected as shown in figure to one another and to points A B and D at potentials VA V and V Then the potential at O will be 2 3 B VA VB VD C C C VAC1 VBC2 VDC3 C C C VAVB VB VD VD VA C C C3 VA VB VD C C C C3 C C 2 In the circuit shown in the figure each capacitor 12 fra C C exigent 1 2 3 C seraftrat V V V B V VB VD C C Cs VAC VC VpC C C C3 VA VB VB VD VD V C C C VA VB VD C C C C3 C3C fax feat une entran

A coil has 500 turns and the flux through the coll is 32 4t 9 milliweber The magnitude of induced emf between the ends of coil at t 5 s is 1 34 milivolt 2 17 volt 3 17 milivolt 4 34 volt

A square wire of side 3 cm is placed perpendicular to principal axis at a distance 25 cm from a concave mirror of focal length 10 cm What is area enclosed by image of the wire 4 cm 9 cm 12 cm 16 cm

15 What is a rectifier used for a Convert ac voltage to dc voltage Ob Convert dc voltage to ac voltage Oc Measure resistance O d Measure current

The angular diameter of a planet measured from earth is 90 If the diameter of the planet is x 10 m then its distance from the earth is B 7 2x10 m E 1 8 108 m A 3 6 10 m D 7 2 106 m C 3 6x 106 m

2 Minimum frequency of audible sound is 20 Hz and maximum frequency is 20 000 Hz If we compare the sound levels of these two frequencies of same amplitudes their difference will be a 30 dB b 60 dB c 90 dB d 120 dB

3 A man measure his weight by standing on a weigh ing machine If he leaps on the left side of the ma 2xco chine then its reading 12 mgr 1 remains same 2 increases 3 decreases to to zoro 610

An isosceles right angled glass prism is immersed in water The refractive indices of 4 3 3 glass and water relative to air are and respectively If a ray of light is incident normally on the shorter face of the prism inside water the angle in degree of deviation it will suffer as it comes out of the prism will be

In an experiment of simple pendulum the errors in the measurement of length of the pendulum L and time period 7 are 3 and 2 respectively The maximum percentage error in the value of T O 5 O 7 O 8 is

When light is refracted into a medium from vacuum then Its wavelength and frequency both change Its wavelength increases but frequency remains same Its wavelength decreases but frequency remains same Its wavelength and frequency both decrease

13 A parallel plate capacitor is charged by connecting it to a battery Which of the following will remain constant if the distance between the plates of the capacitor is increased in this situation 1 Point O Energy stored O Electric field O Potential difference O Capacitance

A person walks up a stalled escalator in 90 sec 19 When standing on the same escalator now moving he is carried up in 60 seconds How much time would it take him to walk up the moving escalator 1 36 sec 2 42 sec 3 18 sec 4 9 sec A coin is released inside a lift at a height of 2 m 20 3 5 sec 98 m s safe for yok R E DER ER PLANT 1 36 sec 3 18 sec 4 5 sec 99 m s 360 sec 90 sec gn that m 2 42 sec 4 9 sec OF

3 dielectric strength 4 dielectric constant Two large metal plates are placed parallel to 3 each other The inner surface of plates are charged by and coulomb m The electric field between the plates and outside the plates to e 3 Eo Eo o 2 0 zero 4 zero zero 3 ang fer for 3 20 4 qurdgal atingere con s t m zero 6 4 I 20 Eo zero zero

3 ALLEN An iron ball of mass 100 g moving with a 28 velocity of 10 m s collides with a wall at an angle 30 with wall rebounds at the same angle with the same speed If period of contact between the ball the wall is 0 1 sec the force experienced by the wall is 1 10 N 3 IN 2 100 N 4 0 1 N A mass M is suspended by a rope from a rigid 29 100 gm fe ang yon alan 30 ufa na sit alam 0 1 sec dar a sua for 1 10 N 3 IN Manta 10 m s 2 4 100 N 0 1 N

process A circular loop of radius 4 cm and carrying current 0 2 A is placed in a uniform magnetic field of induction 0 4 T and perpendicular to the plane of the loop Calculate the force on the arc of the circle of length 4 3 cm non of radius R carries a

4 1 An a particle is accelerated by a potential difference of 104 V Find the change in its direction of motion if it enters normally in a region of thickness 0 1m having transverse magnetic induction of 0 1 Tesla Given mass of a particle 6 4 10 7kg

Consider the arrangement shown in figure The 10 fe fan fifay U total energy stored is U when key is closed Now the key S is made off opened and two dielectric slabs of relative permittivity K are introduced between the plates of the two capacitors The slab tightly fit in between the plates The total energy stored is now U Then the ratio of U U is e a 3 2K 1 K 1x 2 K K 4 K fear K fer fargarfiera aga fat fond au u t 1 2K 1 K 3 2 K K 4 T K U

1 Two resistances are connected in two gaps of Meter Bridge The balance 1 point is 20 cm from the zero end A resistance of 15 ohm is connected in series with the smaller of the two The null point shifts to 40 cm What is the value of the bigger resistance a 9 ohm b 18 ohm c 27 ohm d 36 ohm

a 9 kV 51 Four capacitors are connected to a 80 V supply as shown in figure Then the potential differe between the points X and Y is C 2 F C 4 F C 100 1 80 V VELGO V C C c 40 Y d 20 V

released when a radioactive element having mass number A undergoes alpha decay then the velocity of alpha particle is Only one correct answer A B 2Q A 4 2 A 4 E Ama i

ALLEN A thick wire of resistance 2502 is drawn into a 26 thin wire such that its length becomes four times The new resistance of the wire will be 1 500 2 250 3 100 22 4 4000 2502 fara a anten ar fare ar fad and not at at ei an 1 500 2 250 3 100 2 4 4000

38 Given below are two statements labelled as Assertion A and Reason R Assertion A The current density is a vector quantity Reason R Current density has magnitude current per unit area and is directed along the direction of current Select the most appropriate answer from the options given below 1 Point Both A and R are true and R is the correct explanation of A Both A and R are true but R is not the correct explanation of A OA is true but R is false

A ball leaves a horizontal table with velocity Vo 5 m s The ball bounces elastically from a vertical wall at a horizontal distance D 8 m from the table as shown in figure The ball then strikes the floor a distance x from the table g 10 m s The value of xo in meter is T 20m

ion e 40 A cylindrical a constant current The plot of the magnitude of the magnetic field B with the distance d from the centre of the conductor is correctly represented by the figure here curre current resent B n a B assing nough 8 c sect parea R d b d B B R d R d to consider if nothing

Q8 A geostationary satellite orbits around the earth in a circular orbit of radius 36000 km Then the time period of a spy satellite orbiting a few hundred kilo meters above the earth surface Re 6400 km will 2002 approximately be A h B 1h C 2 h D 4h