Physics Questions

Question Number 01 to 15 Only one option is correct A particle starts moving in a circular path of radius R with an initial angular speed rad s and angular retardation radian see The acceleration of the particle will be directed along its velocity after time D it is impossible A 000 X a 2a

0 A spherical capacitor has an inner sphere of radius 12 cm and an outer sphere of radius 13 cm The outer sphere is earthed and the inner sphere is given a charge of 2 5 C The space between the concentric spheres is filled with a liquid of dielectric constant 32 Determine the potential of the inner sphere 1 400V 2 450 V 3 500V 4 300V

A body is projected horizontally from the top of a tower with a velocity of 10 m s If it hits the ground at an angle 45 the vertical component of velocity when it hits ground is in m s O 10 10 2 LG Clear Response

In the following circuit of PN junction diodes D D2 and D3 are ideal then I is E R B E 2R C 2E 3R D E R www R ww R

A particle is moving along x axis and its velocity v Vs position x graph is a curve as shown in figure Line PQR is normal to curve at point Q then instantaneous acceleration of particle at x 2m is v m s 1 4 m s Vo 2 8 m s P R 2 0 4 0 x m 3 2 m s 4 insufficient information

A spectral line 5000 in the line coming from a distant star is observed as 5010 The receding velocity of the star is O 1 2 x 107 cm s 6 x 105 m s hr mi O 1 2 x 107 km s

1 38 A particle moves from rest in a straight line with alternate acceleration and retardation of magnitudes a and a respectively during equal intervals of time t Find the space it has described at the end of 2 n such intervals Ans n a a a 2n 1

A point object O is kept in front of a plane mirror AB having length 10m The line AM makes an angle of 53 with mirror An observer initially at point N on line CD start moving from rest towards D on line CD with constant acceleration 7 m s2 Then time for which he will see the object in mirror is C N 1 3 sec 10m 2 53 A 6m Silvered Surface 2 13 sec M 8m 3 4 sec M D 4 4 5 sec

33 The density of water at 20 C is 998 kg m and at 40 C 992 kg m The coefficient of volume expansion of water is 1 10 4 C 2 3 10 4 C milen 3 2x 10 4 C 4 6 10 4 C 4 If 1 g of steam at 100 C steam is mixed with 1 g

7 Monochromatic green light of wavelength 5 x 10 m illuminates a pair of slits 1 mm apart The separation between consecutive bright fringes on the interference pattern formed on a screen 2 m away is 0 25 mm 0 1 mm 1 0 mm 2001 mm

A vector A makes an angle 240 with the positive x axis its components along x axis and y axis are b a A and 3 c A 2 2 and 35 3 414 2 d A 2 A 2 3 2 and 3 and 3A

Consider two non conducting discs touching each other at point P as shown Their uniform surface charge densities and radius are shown in figure Potential at point P is equal to R 2 22R GR TEO GR 2TEO GR P 20

If the net external force acting on the system of particles is zero then which of the following may vary 1 Momentum of the system 2 Kinetic energy of the system 3 Acceleration of centre of mass

5 identical balls placed on smooth horizontal surface If 1st ball moving with velocity u 2 m horizontally collide with 2nd ball and 2nd ball collide with 3rd ball and so on collisions take place If the velocity of 5th ball after collision is 1 5 Find the value of n coefficient of restitution e 1 2 u 2m sec 1 2 3 4 5

4 86 A rocket ejects a steady jet whose velocity is equal to u relative to the rocket The gas discharge rate equals r kg s Determine the acceleration of rocket in terms of the external force on rocket F and the speed u Ans F ru

43 Two ends of a spring are displaced along the length of the spring All displacements have equal magnitude In which case s the tension or compression in the spring will have a maximum magnitude A The right end is displaced towards right and the left end towards left B Both ends are displaced towards right C Both ends are displaced towards left D The right end is displaced towards left and the left end towards right 1 A and D 2 B and C

If in an interference pattern has maximum and minimum intensity is 36 1 ratio then the ratio of amplitudes is 3 4 07 4 O 4 7

Q5 of 90 Mark for review To reach your school at 10 30am let you start at 10 00am First you move 800m towards east then 600m towards north and finally 200m towards west Then net displacement is Clear Resp

Two concentric and R R respectively between R and R is thin metallic shells of radii R R bear charges Q and Q Then the potential at distance r D K Q Q Q 1 r 3 K Q Q r R 2 K 2 Q 4 K Q R R

If the length of second s hand in a clock is 4 cm the angular velocity and linear velocity of the tip is T 1 rad s 1 30 1 2 3 6 15 T rad s 1 T rad s C 750 TC 1500 T 375 T m s m s m s

The angular width of central maxima in Fraunhoffer diffraction with the light of wavelength 6000 and slit width 12 x 10 5 cm is 2 rad 3 rad hr miny O 1 rad

A polaroid is placed in the path of an incoming unpolarised light of intensity lo The intensity of light passing through polaroid after polarisation would be lo 10 2 O 10 4

Ultraviolet radiation of 6 2 eV falls on an aluminium surface work function 4 2 eV The kinetic energy in joules of the fastest emitted electron is approximately O 3 2 x 10 21 3 2 10 19 hr mi 3 2 x 10 17

A small spherical metal ball of radius r is lying at the bottom of a stationary container containing liquid of density p as shown in the figure Po is atmospheric pressure Force exerted by liquid on the upper hemispherical part of the sphere is 4r 1 Question Type Single Correct Type AC r 3 3Po 7rpg

A bicromatic light consisting of wavelength 5000A and 6000A is used to obtain interferance pattern in youngs double slit experiment is 1mm and the distance between plane of slits and screen is 100cm then the least distance from the central maximum where bright fringes due to both the wavelength coincide is 14 28

Two coherent monochromatic light beams of intensities and 4 are superimposed The maximum and minimum possible intensities of the resulting beam are 51 1 51 3 91 1

The dual nature of light is exhibited by O Photoelectric effect O Refraction and interference O Diffraction and reflection hr

Two mirrors one concave and the other convex are placed 60 cm apart with their reflecting surfaces facing each other An object is placed 30 cm from the pole of either of them on the axis If the focal lengths of both the mirrors are 15 cm the position of the image formed by reflection first at the convex and then at the concave mirrors is ONO 19 09 cm from the pole of the convex mirror 19 09 cm from the pole of the concave mirror 11 09 cm from the pole of the concave mirror 11 cm from the pola of the convex mirror

1 An astronaut accidentally gets separated out of his small spaceship accelerating in interstellar space at a constant rate of 100 m s2 What is the acceleration of the astronaut at the instant after he is separated from the spaceship Neglect effect of gravitation of nearby stars etc a 100 m s opposite to direction of motion of spaceship b 100 m s2 along the motion of spaceship c Zero d 50 m s in any random direction

Consider a system of coplanar infinite straight wire and a rectangular loop of resistance 0 Q In as shown in the figure If current in the wire changes from i to 21 charge flowing through the rectangular loop is

Two short bar magnets of equal dipole moment M are Fastened perpendicularly at their centres The magnitude of two magnetic fields at a distance d from the centre on the bisector of the right angle is Por a b c d N Ho M 4 d Ho M 2 4 d Mo 2 2M 4 d Ho 2M AT 13 S

Some currency notes change their colour as you see them This is due to A Diffraction B C Polarization Interference

A bod A of mass M while falling vertically downwards under gravity breaks into two parts a 3 body B of mass M and a body C of mass M 1 4 4 The centre of mass of bodies B and C taken together shifts compared to that of body A towards 1 Body C 2 Body B 3 Depends on height of breaking 4 Does not shift

The angle of polarisation for a pair of medium is 60 then the critical angle is sin 3 tan 3 O cos 3 hr min sin 1

body of mass 2 0 kg is at rest at height of 10 m above the ground Calcul LE after it has fallen through half the height tions 98 J 98 J 110 J 120 J 20 J 40 J 90 J 30 J

Young s double slit experiment is performed in air and then performed in water The fringe width Will remain same Will decrease Will increase hr miny Will be infinite

A cubicla room is formed with 6 plane mirrors An insect moves along the diagonal of th floor with uniform speed The speed of its image in two adjacent walls is 20 2cm s Then the speed of the image formed on the roof is ONO 20cm s 40 cm s 20 2cm s 10 5cm s

icate departure from the inverse square law Example 1 11 The electric field components in Fig 1 27 are E ax E E 0 in which a 800 N C m2 Calculate a the flux through the cube and b the charge within the cube Assume that a 0 1 m Z a a a a

An electric lamp designed for operation on 10V AC is connected to a 220V AC supply through a choke coil of inductance 2H for proper operation The angular frequency of the AC is 100 10rad s If a capacitor is to be used in place of the choke coil its cpacitance must be ONO 1 F

a In the figure what value must R have if the current in the circuit is to be 1 2 mA Take 2 4 V 2 4 8 V and r 4 002 b What is the rate at which thermal energy appears in R a Number w i Units S

Two lenses of achromatic doublet should have Equal lens powers Equal dispersive powers Equal ratio of lens powers and dispersive powers Equal magnitude of product of lens

A circular coil has 10 turns with an effective radius of 0 5m and carries a current of 2 amp through it It is kept in a magnetic field perpendicular to its plane initially with 4Wb m The amount of work done to turn it by 60 is B Options 1 10TJ 2 5TJ 3 TJ 4 5 J

Question 22 A The binding energy of deuteron H is 1 112 MeV per nucleon and an a particle He has a binding energy of 7 047 MeV per nucleon Then in the fusion reaction H H He energy Q released is Mass of H 2 01478 amu Mass of He4 4 00388 amu 1 MeV 11 9 MeV 23 8 MeV Maximum Marks 4 00 931 MeV Negative Marks 1 00 x My Answer Correct Ans

sition X B A 30 60 D 60 4 Zero C The correct ascending order of magnitude impulse at points A B C D is 1 A B C D time 2 A B C D

A conducting loop of side L and resistance R moves in its plane with a uniform velocity v perpendicular to one of its sides A magnetic induction R constant in time and space pointing perpendicular and into the plane of the loop exists everywhere The current induced in the loop is

What should be the wavelength of the photon that enters when there is a quantum jump from level 1 to the last occupied level of a Neon atom A 0 079 nm B 1 02 nm C 0 315 nm Correct answer is letter C process needed

X 0374 The diagrams represent the potential energy U as a function of the inter atomic distance r Which diagram corresponds to stable molecules found in nature L 1 r 2 90 90 3 4

A mass of 18 kg moving in a straight line is brought to rest in such a way that it lose kinetic energy at uniform rate of one joule per sec If the initial kinetic energy is 900 find the distance in km travelled before coming to rest

Two particles of mass m and M are initially at rest at infinite distance Find their relative velocity of approach due to gravitational attraction when d is their separation at any instant 2G M m d G M m 2d a V c b G M m V d d G M m 4d tonsig OR fonergy required to raise a satellite to a to that required to

The magnifying power of a compound microscope is high if x Both objective and eyepiece are of high focal length Objective has long focal length and eyepiece small Objective of short and eyepiece are of very large focal length