Physics Questions

Mark correct option or options 1 Mutual gravitational attraction between two bodies can be considered as impulsive force during collision 2 Collision is process in the absence of impulsive force 3 During collision momentum of system may change 4 Mutual gravitational attraction between two bodies cannot be considered as impulsive force during collis

For total internal reflection to occur which of the following is correct Light travels from rarer to denser medium Light travels from denser to rarer medium Light travels in air only Light travels from any one medium to any other medium

Q2 A man fires a bullet standing between two cliffs The first echo is heard after 3 seconds and the second echo is heard after 5 seconds If the velocity of sound is 300m s then the distance between the cliffs is O A 1500m O B 2000m O C 1200m O D 900m

0 The equivalent capacitance between the terminals X and Y in the figure shown will be 1 100 pF X 200pF 200pF 100pF Y 2 200 pF 100pF 100pF 100pF 3 300 pF 4 400 pF

29 A thin disk of radius R is held closing the opening of a thin hemispherical shell of the same radius Both the bodies are made of insulating materials and have uniform charges of surface charge density geach The plate is released keeping the shell fixed How much maximum kinetic energy will the plate acquire after it is released 6 a R o 800 Ro TR 0 480 d Insufficient information

Q1 The pressure at a depth of 700 m in the ocean is around 7 kPa By how much does the volume of 0 2 m aluminum cube contract when it is dropped this depth of the ocean O A 0 2 m O 8 Aluminum cube will not contract O c 20 mm O D 0 2 mm

16 In another world instead of the Coulomb s law electric force F on a point like charge q due to another point like charge Q is found to obey the following law Qa 1 ar 4 r Here a is a positive constant and is the position vector of charge q relative to the charge Q F Q 1 ar 4 over a closed path is also a Electric field due to a point charge Q is E b Line integral of this electric field f d zero as in our world c Gauss law f ds enclosed also holds true for this electric field d All the above statements are true but this electric field is not conservative

A nonconducting ring of mass m and radius R is charged as shown The charged density i e charged per unit length is It is then placed on a rough nonconducting horizontal surface plane At time t 0 a uniform electric field E Ei is switched on and the ring start rolling without sliding Determine the friction force magnitude and direction acting on the ring when it start moving

28 In a standard YDSE set up performed with light of wavelength 600 nm one of the slits is covered with a transparent sheet of thickness 12 0 m and refractive index 1 5 If the fringe width is 0 5 mm then the shift in the fringe pattern due to introduction of the sheet is 1 1 mm 3 4 mm 2 3 mm 4 5 mm

15 Due to a point charge potential and electric field at a point A are 7 V and 3 V m respectively and electric field at a point B is less than 3 V m Now magnitude of the charge is tripled If electric field at B becomes 3 V m potential at B will become closest to a 7 V c 21 V b 12 V d Insufficient information

A bullet of mass m and speed v hits a pendulum bob of mass M at time t t and passes completely through the bob The bullet emerges at time t t with a speed of v 2 The pendulum bob is suspended by a light rigid rod of length 7 After the collision the bob can barely swing through a complete vertical circle At time t t3 the bob reaches the highest position What quantities are conserved in this process total kinetic energy of the bob and the bullet during the time interval At t t total momentum of the bob and the bullet during the time interval At t t total mechanical energy of the bob and the bullet during the time interval At t3 t Momentum of the bob after t 1 Save Ne

24 Three identical electric dipoles are arranged parallel to each other at equal separations as shown in the figure The separation between the charges of a dipole is negligible as compared to the separation between the dipoles In the given configuration total electrostatic interaction energy of these dipoles is Uo Now one of the end dipole is gradually reversed how much work is done by the electric forces 17U b a c 18 18U 17 d 17U 18 18U 17

11 A solid cube is subjected to equal normal forces on all its faces The volumetric strain will be x times the linear strain in any of the three axes when a X 1 b X 2 c X 3 d X 4

In the figure shown there is a coin placed at the bottom of the bucket that contains two immiscible liquids transparent the apparent depth of the coin from surface as seen normally from the above is 1 3d 3 5d 2 2d 2 d 2 4 3d 2 5d

43 The angle of incidence for a ray of light at a refracting surface of a prism is 45 The angle of prism is 60 If the ray suffers minimum deviation through the prism the angle of minimum deviation and refractive index of the material of the prism respectively are 2016 a 45 1 2 b 30 2 b 15 1

3 In an a particle Rutherford scattering experiment angle of deviation of scattered a particle is 1 independent of impact parameter 2 directly proportional to impact parameter 3 inversely proportional to impact parameter 4 majority of a particles get deviated by 180

Q15 The pressure inside a commercial airliner is maintained at 1 00 atm 105 Pa What is the net outward force exerted on a 1 0 m x 2 0 m cabin door if t outside pressure is 0 30 atm O A 140000 N O B 140 N O C 1400 N O D 14000 N

BA If the volume of a gas is decreased by 10 during isothermal process then its pressure will be 1 decrease by 10 2 increase by 10 3 decrease by 11 11 increase by 11 11 work done in the following indicator diagram is

6 In a YDSE distance between the slits is 2 mm the distance of the screen from the slits is 1 m and the wavelength of light used is 5000 A The fringe width is 1 0 25 cm 3 0 25 mm 2 2 5 cm 4 1 5 mm

06 Of the following situations which one is impossible O A A body having constant velocity and variable acceleration O B A body having velocity along the eastern direction and the acceleration in the westem directio C Abody having zero velocity and non zero acceleration O D A body having constant acceleration and variable velocity

Zero Marks 0 In all other cases A satellite with mass 2000 kg and angular momentum magnitude 2 10 2 kg m s moving in an elliptical orbit around a planet The rate at which area is being swept out by the satellite around the planet is equal to 10 m s find x y maturu u me TERMENIMA with the

A chain of mass m forming a circle of radius R is slipped on a smooth round cone with half angle 0 Find the tension in the chain if it rotates with a constant angular velocity o about a vertical axis coinciding with the symmetry axis of the cone A R gcot 8 C R g cot 8 B Rg cot D Rwg cot

Two smooth spherical non conducting shells each of radius R having uniformly distributed charge Q Q on their surfaces are released on a smooth sun conducting surface when the distance bet 5R The mass of A is m and that of B is 2m The speed of A just before A and B collide is Neglect gravitational interaction take K 40 0 mA ITTITAITEET 5R B TETT 2m

In given two cases two concentric conducting spherical shells are arranged as shown In case 1 when switch S is closed energy loss is Q In case 2 when switch S is closed energy loss is Q then find Q Q in Joule Assume q 2 C r 10cm Neutral 2r 9 Case 1 S 2r q Neutral Case 2

31 Three polaroids P P2 and P3 are kept such that P and P3 are crossed and if the angl between the pass axes of P2 and P is 37 and the intensity of unpolarized light incident o P is Io then the intensity of light coming ou of P3 will be nearly 1 111 810 25 3 0 P 2 4 1610 25 7210 625 P3

A block of mass 5 kg is pressed against a wall with a horizontal force of 100 N If the coefficient of friction between the surfaces is 0 8 Then frictional force acting on the block is A D 80 N 50 N 20 N 30 N

Figure shows two large cylindrical shells having uniform linear charge densities A and A Radius of inner cylinder is a and that of outer cylinder is b A charge particle of mass m charge lens in a cince of radius r Then its speed v is Neglect gravity and assume that radii of both the cylinders to be very small in comparison to their length

Which of the following is true 1 Lyman series is a continuous spectrum 2 Paschen series is a line spectrum in the infrared c 3 Balmer series is a line spectrum in the ultraviolet 4 The spectral series formula can be derived from the Rutherford model of the hydrogen atom

22 Small identical balls are attached at each end of a spring of force constant k 200 N m and relaxed length 1 20 cm Unknown amount of charges are gradually transferred to the balls in unequal amounts until the spring length becomes twice of its relaxed length What amount of work must be done by an external agency in slowly compressing the spring back to its relaxed length a 8 J c 16 J b 12 J d 20 J

4 m m 2 m m 3 1 4 m v m v Two identical particles move towards each other with velocity 2v and v respectively This velocity of centre of mass is 4 zero 1 v 2 v 3 3 v 2 Consider the following two statements 1

The V versus x plot for six identical metal plates of cross sectional area A is as shown The equivalent capacitance between 2 and 5 is Adjacent plates are placed at a separation d 10V 5V OV 1 2 3 4 5 X

A block A of mass m moving with a velocity v along a frictionless horizontal track and a blocks of mass m 2 movi with 2 v collides with plank elastically Final speed of the block A is I 5v 3 2 v 2 4 none of these m A 2v m 2 B

A charge q is placed at the corner of a cube of side a The electric flux through the cube is Zero 9 380 9 680 9 880

09 A beam of light consisting of two wavelengths 800 nm and 600 nm The beam is used to obtain interference fringes in Young s double slit experiment screen kept at a distance 1 4 m away from slits The slits are separated by a distance of 0 28 mm The least distance from central maximum where bright fringes of two wavelengths coincide is O A 3rd bright of 800 nm will coincide with 4th bright of 600 nm O B 4th bright of 800 nm will coincide with 3rd bright of 600 nm C 3rd bright of 800 nm will coincide with 2nd bright of 600 nm O D 2nd bright of 800 nm will coincide with 3rd bright of 600 nm

In case of diffraction pattern of a single slit under polychromatic illumination first minima of wavelength A is found to coincide with the second maxima o wavelength X2 then 3 1 22 2 5 A A 2 5 A 5 A

An electric dipole of dipole moment p 6 x 10 C m is placed in a uniform external electric 4 N field of intensity 2x 105 as shown in the figure The angle between net electric field with external electric field E at point A will be k r p 45 37 53 0 r 3m A E

11 A thin prism P of refracting angle 3 and refractive index 1 5 is combined with another thin prism Q of refractive index 1 6 to produce dispersion without deviation Then the angle of prism Qis 1 3 3 3 5 2 2 5 4 4

The equivalent capacitance between point A and B is OCIA 2 52 A B C 14 3 C 4 20

26 A flat air capacitor C consists of two large plates that are close to each other Initially one of the plates was not charged while the other had charge Q If entire space between the plates is filled with a slab of finite electrical resistance estimate total amount of energy lost in the slab a c Q 20 3Q 8C b d Q 8C 7Q 8C

2 In the given figure O is the point object and I represents its real image from a concave mirror of focal length f then symbols have their usual meaning 1 f 3 f x x 2 2x x X X X1 C 2 f x x 4 f x x 2 EN PARK CO NAN

A uniform electric field of strength E exists in a region An electron charge e mass m enters a point A with velocity Vj It moves through the electric field exits at point B Then y 2amv ed E Rate of work done by the electric field at B is Rate of work by the electric field at A is non zero Velocity at B is 4ma v d 2av d 0 0 A a 0 B 2a d X

An inventor claims that when temperature of source and sink are 127 C and 27 C respectively then efficiency of engine is 26 then 3127 27nd and af sig 26 at A It is impossible B It s possible but possibility is less 46 47 4 C It s possibility is high D Data is insufficient Kics i Your Answer C

10 A converging lens of glass has its optica power P in the air If it is medium whose refractive index immersed in is less tha EEN A that of lens then its optical power will be 1 More than P 2 Less than P 3 P 4 Cannot be calculated

Figure I igure II P P 18 Consider a cube as shown in the figure I with uniformly distributed charge in its entire volume Intensity of electrical field and potential at one of its vertex P are Eo and Vo respectively A portion of half the size half edge length of the original cube is cut and removed as shown in the figure II Find modulus of electric field and potential at the point P in the new structure a c Eo 2 3E 4 and and 3V 4 7Vo 8 3E b and 4 7E 8 d and Vo 2 7V 8

pher 20 Consider a thin conducting shell of radius r carrying total charge q Two point charges q and 2q are placed on points A and B which are at distances 0 5r and 2r from the centre C of the shell respectively If the shell is earthed how much charge will flow to the earth a 2q c 4q b 3q d More than 2q and less then 3q 0 5r 2r

The truck left city A for city B at a speed of 40 km h and 45 minutes later the car left A for the same direction at a speed of 60 km h which reached city B and returned to city A The car met the truck for the second time on the way back which had to cover 20 km before reaching city B How many minutes after its departure did the car meet the truck for the

139 The refracting angle of a prism is A and refractive index of the material of the prism is cot A 2 The angle of minimum deviation is 2015 b 90 A d 180 3A a 180 2A c 180 2A 140 Two identical thin plano convex glass lenses

27 During a short interval of time the velocity v in meters per second of an automobile is given by v at bt where the time t is in seconds The units of a and b are respectively A s m s m B m s m s3 c m s m s D ms2 ms4 Marks

14 A sample gas expands from volume V to V Amount of work done by the gas is greatest when expans A Equal in all cases B Isobaric c Isothermal m Adiabatic

Q3 A car has a fresh battery of emf 12V and internal resistance 0 050 If the starter motor draws a current of 90A the terminal voltage when the starter is on will be O A 10 5V O B 7 5V O C 2 5V O D 12V