Physics Questions

24 2 7 kg 3 17 kg 4 3 kg The force F acting on a particle of mass m is indicated by the force time graph shown below The change in momentum of the paticle over the time interval from 0 to 8 s is NEET 2014 1 24 N s 2 20 N s F N 4 6 3 s 3 12 N s 4 6 N s 2x6x2 x3 42x3 6 6

If two soap bubbles of radius 2 cm and 4cm respectively are combined in vacuum in isothermal conditions to form a single soap bubble then radius of combined soap bubble is Question Type Single Correct Type 1 2 5 cm 2 5 cm 3 4 3 cm 5 cm

A simple pendulum 50 cm long is suspended from the root of a cart accelerating in the horizontal direction with constant acceleration 3g m s The period of small oscillations of the pendulum about its equilibrium position g m s L 50 cm 1 0 s O 2 S O a 3g m s

1 A 2C 2 A 2C 3 A A ray of monochromatic light is incident on one refracting face of a prism of angle 75 It passes through the prism and is incident on the other face at the critical angle If the refractive index of the material of the prism is 2 the angle of incidence on the first face of the prism is 1 30 2 450 3 60 4 0 prism of small angle A and emerges normally from the opposit

3 14 0 x 10 N 4 1 75 x 10 N Two particles of masses m and m in projectile motion have velocities and i respectively at time t 0 The collide at time to Their velocities become V and V at time 2t while still moving in air The value m m v m m is 1 Zero 2 m m gt 3 2 m m gt 4 m m gt

A quantity of heat Q is supplied to a diatomic gas which expands at constant pressure The fraction of heat supplied that contributes to the change in internal energy of the gas will be 517

An ideal gas has 3 rotational degrees of freedom and 3 translational degrees of freedom The ratio of molar specifi heat of the gas at constant pressure to that at constant volume will be 43 2 5

1 300 2 45 3 A ray of light is incident at angle i on a surface of a prism of small angle A and emerges normally from the opposite surface If the refractive index of the material of the prism is u the angle of incidence i is nearly equal to 3 A 1 A 2 A 2 4 A 2 A prism having an apex angle of 4 and refractive index of 1 50 is located in front of a vertical plane mirror as shown 11 deviated is

6 What should be the value of distance d so that final image is formed on the object itself focal lengths of the lenses are written on the lenses 1 10 cm 2 20 cm 10cm 10cm 3 5 cm 20cm 4 none of these onuar lens of focal length 10 cm The obiect is

Mass 1 kg body explodes into three fragments The ratio of their masses is 1 1 3 The fragments of same mass move perpendicular to each other with speeds 30 m s while the heavier part remains in the intial direction The speed of heavier part is 1 10 10 2 m s 3 20 2 m s 4 30 2 m s

A ball collides with an inclined plane of inclination 0 after falling through a distance h If it moves horizontally just after the impact the coefficient of restitution is 1 tan 0 2 cot 0 3 tan 0 4 cot 0 A solid iron ball A of radius r collides head on with another stationary solid iron ball B of radius 2r The ratio of

4 90 cm 2 180 cm 3 45 cm 4 360 cm A thick plane mirror shows a number of images of the filament of an electric bulb Of these the brightest image is the 1 First 2 Second 3 Last 4 Fourth Two vertical plane mirrors are inclined at an angle of 60 with each other A ray of light travelling horizontally is dent devietion is

A mass of 100g strikes the wall with speed 5m s at an angle as shown in figure and it rebounds If the contact time is 2 x 10 sec what is the force applied on the mass by the wall y 60 250 3 to right Vsie 2 250 N to right bus 100g 60 3 250 3 N to left 4 250 N to left speed

10 What the number that measures an object s resistance to being deformed elastically when stress is applied to it a Elastic modulus b Plastic modulus c Poisson s ratio d Stress modulus

Water rises upto a height h in a capillary tube on the surface of the earth Th value of h will increase if the experimental setup is kept in g acceleration du to gravity a lift going upward with a certain acceleration a lift going down with acceleration a g accelerating train a satellite rotating close to earth

1 28 ms On a frictionless surface a block of mass M moving at speed v collides elastically with another block of same mass M which is initially at rest After collision the first block moves at an angle 9 to its initial direction and has NEET 2015 a speed v 3 The second block s speed after the collision is 2 5 3 2 2 3 4

13 Some structural members subjected to a long time sustained loads deform progressively with time especially at elevated temperatures What is such a phenomenon called a Fatigue b Creep c Creep relaxation d Fracture I

14 The straight wire AB carries a current I The ends of the wire subtend angles 8 and 8 at t point P as shown in figure The magnetic field at the point P is a c Hol 4 Hol 4ra sin 0 sin 0 cos 0 cos 0 B A 0 P b d Hol 4 Hol 4 sin 0 sin 0 cos 0 cos 0 are loons A B and C Identify

Three waves of equal frequency having amplitude 10 m 4 um and 7 um arrive at a given point with successive phase 7 difference of The amplitude of the resulting wave in um 2 is given by 07 6

46 Which of the following relation s is are always correct p linear momentum dv dm dp dt 4 F m v dv dm dt dt dt dt of more 3 kg moving with a speed of 100 m s strikes a wall at an angle 60 as shown in figure 1 thrust u Urel 2 F m 3 F m

A hiker stands on the edge of a cliff 490 m above the ground and throws a stone horizontally with a speed of 15 m s1 The time taken by the stone to reach the ground is Question Type Single Correct Type 1 2 3 5 s 10 s 12 s

6 The body will regain it is ious shape and size only when the deformation caused by the external forces is within a certain limit What is that limit a Plastic limit b Elastic limit c Deformation limit d None of the mentioned

ALL the equivalent resistance between the points A and D Infinite ladde 1 100 A 220 2 3 30 2 4 40 2 C In the circuit sho 10 CA www 10 0 10 02 10 C www 10 03 www 10 0 10 0 www 10 0

3 change in pressure 4 change is heat A The volume of a gas is reduced to 1 4 of its initial volume adiabatically at 27 C The final temperature of gas will be if y 1 4 N300 4 0 4 K 3 27 x 4 0 K Pry 300 2 100 x 4 0 4 K 4 300 x 1 4 0 4 K morpheric pressure and temperature 27 C such that its temperature

A 50 g bullet moving with velocity 10 m s strikes a block of mass 950 g at rest and gets embedded into it The loss in kinetic energy will be RPMT 2009 1 100 2 95 3 5 4 50 hall of mass m moying with the velocity v collides haed on with another ball of mass mat rest If the coefficient CRPMT2014

9 What kind of elastic materials are derived from a strain energy density function a Cauchy elastic materials b Hypo elastic materials c Hyper elastic materials d None of the mentioned I

Find the heat energy required to raise the temperature of n moles of a gas from To to 2To if its molar heat capacity varies as shown in the diagram The equation of the curve is CT constant CA 4C C T 2T

What will be the acceleration due to gravity at a point which is at the distance R from 4 Earth s centre R is radius of earth go is acceleration due to gravity at surface of earth Question Type Single Correct Type 1 2 3 90 4 3go 4 90 2

Given the velocity function v t 5cost 5sint 2t a Find the position function wherer 0 0 0 7 Answer b Find the magnitude of the net force of the object if the mass is 10 kg with the given velocity func Hint F ma Answer F to the nearest two decimal places

010 Ideal gas in a closed container initially having volume V and pressure P If the final pressure is 4P and volume is kept constant what is the ratio of the initial kinetic energy with final kinetic energy O A 12 O 8 4 1 0 0 21 O D 14

8 As the elastic limit reaches tensile strain a Increases more rapidly b Decreases more rapidly c Increases in proportion to the stress d Decreases in proportion to the stress

A shell explodes in a region of negligible gravitational field giving out n fragments of equal mass m Then its total 1 Kinetic energy is smaller than that before the explosion 2 Kinetic energy is equal to the before the explosion 3 Momentum and kinetic energy depend on n 4 Momentum is equal to that before the explosion

Two blocks of masses 10kg and 4kg are connected by a spring of negligible mass and are placed on a frictionles horizontal surface An impulse gives a speed of 14 ms to the heavier block in the direction of the lighter block The the velocity of the centre of mass is 1 30 ms 1 2 20 ms 3 10 ms 4 5 ms

2 486 J 3 524 J 4 324 J A shell of mass 200 g is ejected from a gun of mass 4 kg by an explosion that generates 1 05 kJ of energy The ini velocity of the shell is AIPMT 200 1 100 ms 2 80 ms 3 40 ms 4 120 ms

Cooking gas containers are kept in a lorry moving with uniform speed The temperature of the gas molecules inside will 47 2 decrease 273 remain same 4 decrease for some while increase for others 320 At what temperature is the rms velocity of a hydrogen molecule equal to that of an oxygen molecule at 47 C 1 increase

A gas undergoes a process in which its pressure P and volume V are related as VP constant The bulk modulus the gas in the process is 1 nP 2 p n 3 P n 4 Pn

2 Two similar thin equi convex lenses of focal length feach are kept coaxially in contact with each other such that the focal length of the combination is F When the space between the two lenses is filled with glycerin which has the same refractive index u 1 5 as that of glass then the equivalent focal length is F The ratio F F will be 1 2 1 2 1 2 3 2 3 4 3 4 Two parallel infinite line chora with lingor

Let V1 be the frequency of first line of Lyman series and V2 be the frequency of first line of Balmer series then the frequency of second line of Lyman series is 1 V V 2 V V 3 V V1 V V2 4

1 m of a gas is compressed suddenly at atmospheric pressure and temperature 27 C such that its temperatu becomes 627 C The final pressure of gas will be y 1 5 1 27 x 105 N m 2 7 2 x 105 N m 3 2 7 x 105 N m 4 27 x 105 N m in the whole cycle

An incident ray strikes a medium whose relative refractive index with respect to surrounding is 3 at grazing angle 30 If the refraction and reflection both take place at the boundary The angle between reflected and refracted rays is 1 40 3 50 2 60 4 90

14 Find the strain of a brass rod of length 100mm which is subjected to a tensile load of 50KN when the extension of rod is I equal to 0 1mm a 0 01 b 0 001 c 0 05 d 0 005

Q11 Agas is taken through an adiabatic process in which the volume changes from an initial value of 1600 cc to 400 cc If initial pressure of the gas was 150 kPa calculate the work done by the gas in the adiabatic process assume Y 1 5 O A 800 J O B 630 J O C 480 J O D 1200 J

When two bodies collide elastically the force of interaction between them is conservative 2 non conservative 3 either conservative or non conservative 4 zero

Morning breakfast gives 5000 cal to a 60 kg person The efficiency of person is 30 The height upto which the person can climb up by using energy obtained from breakfast is 1 5 m 2 10 5 m 3 15 m 4 16 5 m

A charge of Q1 8 0 pC is distributed uniformly on a spherical surface radius R 0 02 m and a second charge of Q2 3 0 PC is distributed uniformly on a concentric spherical surface radius R2 0 04 m Determine the magnitude of the electric field 0 34 m from the center of the two surfaces in N C Write your answer with two digits after decimal Q 8 0 pC R1 R2 Q2 3 0 PC

A small ball of mass m and radius r 10 rolls without slipping along the track shown in the figure The radius of circular part of the track is R If the ball starts from rest at a height of 8R above the bottom the normal force on the ball at the point P is 8R A mg 100 3 Your Answer 100 10 mg B R 200 9 C mg Correct Answer P

Two masses are connected by a spring as shown in the figure One of the masses was given velocity v 2 k as shown in figure where k is the spring constant Then maximum extension in the spring will be a 2 m Smooth m m 2mk 4 3mk

Two circular plates of radius 0 2 m are used to form a parallel plate capacitor displacement current between the plates is ampere then the magnetic field produced by displacement current at 0 1 m from the axis of the plate will be 5 x 10 7 T 4 x 10 7 T 5 x 10 6 T axis of the plate

144 A astronomical telescope has objective and eyepiece of focal lengths 40 cm and 4 cm respectively To view an object 200 cm away from the objective the lenses must be separated by a distance 2016 me ito a a c 37 3 cm 50 0 cm b 46 0 cm d 54 0 cm

Q5 The figure gives the free body diagram when several forces act on an object pulling it along a frictionless flat floor What will be the direction of acceleration of the object 7N 2N y SN AN O A x direction O B y direction O C y direction O D x direction SN