Physics Questions

The position co ordinates of a projectile thrown from ground are given by y 12t 5t2 m and x 5t m The initial speed of throw is Here t is in second 1 10 m s 3 11 m s 2 13 m s 4 17 m s

6 In T S diagram ratio of slope of an isobaric 6 curve and an isochoric curve is 1 Y 2 Y 3 y 4 Zero T S 1 Y 2 3 y

Force experienced by a charged particle in an electromagnetic field is zero If the charge on the particle is q velocity of the particle is and the electric and magnetic fields are E and B respectively then which of the following is possible OE 0 B 0 0 9 0 O E 0 B 0 0 90 OE 0 B 0 0 q 0 All of these

Unleashing Potential 11 A disc having radius a is rising on an inclined plane as shown in figure If the acceleration of disc 2 is gsine then find the value of b Ans 3 Sol 2 mg sine mg sin 0 f nacm ma f a a 2 aam a a on solving F mg cos 1 3 4 Fixed wedge Jable TUTE 5

18 18 Pressure verses temperature graph of an ideal gas at constant volume is shown by a straight line A in figure If the mass of the gas is doubled and volume is halved the corresponding pressure verses temperature graph is givey by line P 1 A 2 B B C T 3 C 4 D farger a ten Aaferent TOUR 34 3 water ani 1 A B th 2 B 3

Two identical progressive waves moving in opposite direction superimpose to produce a stationary wave The wavelength of each progressive wave is X The wavelength of the stationary wave is A B C 4 NIX 2

15 Two satellites of mass m and 2 m are revolving in two circular orbits of radii r and 2r around an imaginary planet on the surface of with gravitational force is inversely proportional to distance from its centre The ratio of orbital speed of satellites is 1 1 1 2 1 2 3 2 1 4 1 5

of mass M is in vertical position and that is able to move up or down without friction as shown in figure If the temperature is increased M 1 Both P and V of the gas will change 2 Only P will increase according to charle s law 3 V will change but not P 4 P will change but not V The pressure of a gas is decided by fan 13 fferent M 1 Pava 2 3 V ufafa 4 Pufafdam 4 1 fo

Consider four heat reservoirs A B C D An 7 engine working between A and C has an efficiency which is mean of efficiencies of same engine working between AB and AD Then absolute temperture of C will be A is source 1 Geometric mean of temperature of A D 2 Arithmetic mean of temperature of B D 3 Harmonic mean of temperature of A D 4 Sum of temperatures of A and D 1 2 BD 3 AD 4 AD A B C D C AND ADQUIER Gal Asia CRIER pat 34ff4

Pressure of an ideal gas is increased by keeping 11 temperature constant What is its effect on kinetic energy of molecules 1 Increases 2 Decreases 3 No change 4 Cannot be determined cylinder containing an ideal gas has a piston 12 a fed ved 1 2 3 4 Uch fucuc UCH B della MECHEN fare

A straight conductor of length is wound in to a circular coil of n turns For a current i flowing through the coil the magnetic induction at the centre is B When the coil is now wound to 2 n turns magnetic induction at the centre will be A 4 B C 2 B B 3 B D B

A block of ice at 0 C is slowly heated and converted into steam at 100 C Which of these curves represents the phenomenon quantitatively L Time 1 Time 2 Time Time 5 g ufafa faz al 1 L 319 4 3 244 2 ALLEN 100 C THE

d If the X then t is constant 18 Two thin circular discs of mass m and 4m having radii of a and 2a respectively are rigidly fixed by a massless rigid rod of length 24 a through their centers This assembly is laid on a firm and flat surface and set rolling without slipping on the surface so that the angular speed about the axis of the rod is w The angular momentum of the entire assembly about the point O is L see the figure Which of the following statement s is are true 2016 Adv m a 4m Co 2a 20 A sph plane In th a

The following figure shows position time graph of an object moving along x axis Based on the information represented by the graph answer the following questions x m 4 t s 2 3 4 5 6 24 The position of the object at f 4 sis 1 1 2 2 3 3 4 4 25 The displacement of the object for the time interval t 0 to t 3 s is 1 1 2 2 3 3 4 2 5 26 The position of the particle is x 1 m at time instant t 1 1 1 s 3 1 s as well as 5 s 2 5 s 4 1 5 s as well as 53 27 The average velocity for the time interval t 0 to t 4 sis 1 1 m s 3 0 5 m s 28 The average speed and average velocity have same numerical value for the time interval Y0 2s 2 0 5s 3 Both 1 2 4 0 6 s 29 The average speed for the time interval 0 6 s is 0 67 m s 2 0 5 m s 2 2 m s 4 0 75 m s TIC

Speed of sound in air at room temperat approximately 343 m s What can be the of sound in Hydrogen at room tempe approximately 1 1284 m s 3 686 m s 2 2089 m s 4 440 m s

ns Col A particle of mass 2kg is placed at rest at origin A force F 21 33 5k is acting on particl At t 4sec the position vector of particle is found to be 8i bj 20k Find b 1 12 2 6 3 2 4 10 1 a F 2 3j 5k 2 m P r ut at 1 x y 2k O 0j OK 2 3j 5k 4 2

A string of mass 0 1 kg is under a tension 1 6 N The length of the string is 1m A transverse wave starts from one end of the string The time taken by the wave to reach the other end is 0 30 s 0 50 s A B C D 0 25 s 0 75 s

3GM r 3 D If gravitational field intensity is E at distance R 2 outside from then surface of a thin shell of radius R the gravitational field intensity at distance R 2 from its centre is 1 Zero 3 2E 4 6GM 5r 2 2E 3E

1 R 17 Specific 1 3R capacity of a solid is 2 2R 3 3R heat capacity of water is 2 6R 3 5R 4 4R 4 9R Uch Stol 1 R SHI Bird 1 3R 2 2R 17 fafence 3 enfan 2 6R 3 3R 3 5R 4 4R 4 9R

8 For the phase diagram of water given in figure 8 curves OA AB and AC are respectively P atmospheric pressure B liq solid A vapour T 1 Sublimation curve vaporisation curve and fusion curve 2 Sublimation curve fusion curve and vaporisation curve 3 Fusion curve vaporisation curve and sublimation curve 4 Fusion curve sublimation curve and 3 ACT P1 1 2 3 fay fanfaten A B 4 9 B FE A T

Hi there I m Harsh Vadher I say In si mple way that you please take cordin ate system and draw line with 1 obtu se slope 2 acute and 3 zero than I c ommited option 2 correct Cause for 1 case take xt graph upper X1 5 and down X2 3 and give t1 t2 time I got Vavg 2 At take mod but it s spee d avg is 3 At because it s distance fr om up measured 3m to down And rest 3 4 optio correct 1 Objective Type Questions More than one options are correct Select the correct statements For a particle moving on a straight line 1 Average speed is always equal to magnitude of average velocity 2 Average speed may be greater than magnitude of average velocity JE 3 Average velocity instantaneous velocity if velocity is constant 4 Moving with constant acceleration average velocity for a given time interval is arithmetic

2 Coefficient of volumetric expansion a is not a constant It depends on temperature Variation of a with temperature for metal is pa K T 1 a 2 1 T Bu a f 1 161 1 19 T 2 C ufte

A conducting square loop of side length d with its edges parallel to x axis and y axis move with velocity vi in a region having magnetic field B Box k Find the induced emf a y b 1 1s 2 1 81 82 Bd v 2a 82 X x d x E1 B x d a B x Vod a Enot E1 E 2 Bd v a Bv d Bd v 3 2a INSTITUTE Reliable

The absolute minimum temperature for an ideal gas 3 therefore inferred by extrapolating the straight line to the axis in the figure given below This temperature is found to be 273 15 and is designated as Pressure 273 15 C 0 C 1 Kelvin temperature 3 Low temperature Gas A Gas B Gas C Temperature 2 Celsius temperature 4 Absolute zero A y 4 fasay any a ZIA TEN GRO ANY S8 FABREGRI TI 273 15 29 273 15 C 0 C 1 TA 31447 3 A B F 2 feu ar 4

There is a stream of radioactive material having No number of nuclei initially moving with constant speed of 2500 m s If half life of material is 693 s then amount of material remain after they travel a NCERT Pg 448 distance of 2500 km is 1 No 2 4 3 No 2 LARA Dettol 2 G 4 No 2 e No 4

an acceleration of 2 m s2 Answer the following questions As seen by a passenger in car A 36 9 37 Car ATTICAL 1517 1 Con 2 F increa 4 Fir backward and then backward and then ard finally ases and finally 43 No 44 45 decreases again 39 Taking the moment of start as t 0 the separation between the cars at the moment t 5 s is 37 5 m with A ahead of B 2 37 5 m with B ahead of A 3 50 m with B ahead of A 4 50 m with A ahead of B G 40 The position of car A at this moment t 5 s is 46

91 The frequency of the first line in Lyman series in the hydrogen spectrum is f The frequency of the corresponding line in the spectrum of doubly ionized lithium is 1 f 3 9 f 2 3f 4 27 f NO

body is projected vertically upwards with a velocity of 21m s Find the maximum height reached by the body the time taken by it to reach this height the velocity with which it passes a point A at a height of 10m H the time that elapses when the body passes through A on its downward journey from instant of projection g 9 8m s 22 5 m 2 14 s 15 65m s 3

Which one is the displacement function for wave Where S is the longitudinal displacement 1 S x t a sin ot ky 2 S x t a sin oot kx 4 3 S y t a sin cot kx 4 of a medium particle

block of mass m 4 50 kg on a frictionless inclined plane of angle 30 0 is connected by a cord over a massless frictionless pulley to a second block of mass m 2 80 kg hanging vertically M a What is the magnitude of the acceleration of each block m 0 74 m s m s m 0 74 b What is the direction of the acceleration of m O m accelerates downwards O not enough information m accelerates upwards X c What is the magnitude of the tension in the cord 18 29 XN raw a free body diagram for block 1 and another one for block 2 For block 1 write Newton s second law for motion along the inclined plane For block 2 write Newton s second law for motion along a vertical

From the edge of a vertical cliff 39 2 m high a body is projected vertically upwards with a velocity of 9 8 m s How long does the body take to reach the ground How long does it take to pass through the point of projection With what velocity does it strike the ground 4 s 2 s 29 4 m s

XGM If the energy required to dissemble particles of earth upto infinite distance is Where M Mass of earth R Radius of earth Evaluate x 3 E U U E 0 3 GM 3 GM 5 R 5 R 5R ID

1 The system is released from the rest as shown in the figure All the surfaces are smooth and strings and pulleys are ideal and massless The acceleration of block B just after the release is A m m 2m B

Half life for a radioactive sample is 20 min Find the time interval in between decaying from 33 to 66 occurs 1 40 min ns 3 l T1 2 20 min N N e t N e No 2 60 min In 2 20 min 2 liab INSTITUTE 0 67 et In 0 67 t In In Similarly t t 19 57 min 20 min 100 67 100 34 t t 20 min In 2 100 67 20 min 4 10 min In 2

I V characteristics of solar cell lies in third quadrant of co ordinate axes y A B 14 The Boolean expression Y A B represents the 1 AND gate ZNA 3 OR gate NAND gate NOR gate frache ques A B

A stone dropped from a balloon at rest from a certain height passes through 81 m in the last s before it strikes the ground Find the height of the balloon and the velocity of the stone when it hits the ground 5207 m 319 5 m s

12 In a transformer primary voltage is 220V and secondary current is 0 11A with output power 60W 1 Transformer is step up 3 Transformer is auxiliary Ans 1 Sol P V x Is 60 V X 0 11 V 60 6000 0 11 11 220V V V Vp 220 volt so it is sten un transformer P S 0 11A 60 watt 2 Transformer is step down 4 None of these

A body slips from a balloon ascending vertically with a velocity of 24 5 m s The body reache the ground in 20 s What was the height of the balloon at the instant the body slipped from it g 9 8 m s 1470 m

The transverse stationary wave on a stretc wire Clamped at its both ends is given y x t 0 06 sin x cos 120nt 2A 3 where x and y are in m and t in second length of string is 1 5 m and it s mas 3 x 10 kg then all the points on the w vibrate with 1 Same phase 3 Same energy f 237 2 Same amplitu 4 Different freque

A ball is thrown vertically upward from the ground level with a velocity of 19 6 m s How long does it take to reach the maximum height What maximum height does it reach What is the 28 19 6m 9 8 m s velocity of the ball at t 3s

7 Find the average speed of the Earth as it goes around the Sun in m s Use C 2mr for the total distance the Earth travels in one revolution around the sun where r average Earth Sun distance The average Earth Sun distance is 1 5 x10 m and the time is 1 year 8 From your answer in question 7 determine the magnitude of the average centripetal acceleration of the Earth as it revolves around the Sun

1 Determine the Momem of mertia with respect to the centroidal axes Also find the radius of gyration and polar moment of inertia 15 500 MOM 15 350 650 mm 200

A wave travelling along a string is describ by y x t 0 005 sin 20nt 10 x 2 where x is in cm and t is in sec Calculate displacement y of the wave at a dista x 1 cm and time t 1 sec 1 y 0 0025 cm 2 y 0 0025 cm 3 y 0 005 cm

If electron and proton are accelerated by same potential difference 100 V then find the ratio of their de Broglie wavelength M 9 1 x 10 1 kg Mp 1 6825 10 27 kg 1 43 1 ne 12 27 A 0286 2 43 Ne 12 27 Ap 0 286 ela 40 43 4 40 NSTITUTE

3 S2 29 Three long wires carrying current 10 A 20 A and 30 A are placed parallel to each other as shown Point P and Q are in midway of wires What is ratio of magnetic field at P to the Q 30 A 1 2 1 SACA 2d 20 A P 2d 3 2 10 A P Mo 471 Mon 30 d 27

85 Both light and sound waves produce diffraction It is more difficult observe diffraction with light waves than sound waves because RO light waves do not require medium wavelength of light waves is far smaller than sound waves 3 light waves are transverse 4 speed of light is far smaller than sound Tec

Two identical metal spheres A B are charged with equal amount If A is charged positively B charged nagatively then 1 Mass of A increase 2 Mass of A decrease 3 Mass of B decrease 4 No off

5 A short magnetic needle is pivoted in a uniform magnetic field of induction 1 T Simultaneously another magnetic field of induction 3T is applied at right angles to the first field The needle now deflects through an angle 0 whose value is 1 30 3 90 2 45 4 60

The nuclear binding energy may be approximated by the empirical expression B E q A a A 3 a 2 A a4 A 2Z A Considering a set of isobaric nuclei derive a relationship between A and Z for naturally occuring nuclei A a 2 A a3 az A213 2a b A az A213 2a c A a4 A2 3 293 2 d 2 94 41 13 203

19 Two blocks of equal mass of 4 kg are conne a string passing over a smooth pulley as shown in the figure The acceleration of the centre of mass of the system is g 10 m s T 4 kg Smooth 51 5 m s 3 107 10 m s 4 kg 2 y Lox 15 m s 2 4 21 21 m s