Basic Physics Questions and Answers

The length of a chain is 1 m The chain is lying on a horizontal table The coefficient of friction between the chain and the table is 0 25 What is the maximum length of the chain that can hang out without slipping 120 cml

A rain drop of radius 2mm falls from a height of 500 m above the ground It falls with decreasing acceleration due to resistance of the air viscous force until at half its original height It attains maximum terminal speed of 10 m s and moves with uniform speed there after Select the CORRECT statement A Work done by gravitational force on the drop in the first half of journey is 0 2 Joule B Work done by gravitational force in total journey is 0 164 Joule C Work done by resistive force in first half of journey is 0 163 Joule D Work done by resistive force in IInd half of journey is 0 082 Joule

A pendulum is suspended from the roof of a rail road car When the car is moving on a circular track the pendulum inclines indulun 1 Forward 2 Backward 3 Towards the centre of the path 4 Away from the centre of the path

A compass needle is placed at O in earth s magnetic field When the magnetic dipole moment vector of needle is 60 east of north Then its angular acceleration is found to be maximum the declination at O is X 60 30 90 45 ANorth 60 East

In a double slit experiment at a certain poi on the screen the path difference between t two interfering waves is th of a wavelengt The ratio of the intensity of light at that poi to that at the centre of a bright fringe is 1 0 568 2 0 672 3 0 760 4 0 85

A particle of mass m and charge q is projected from origin with initial velocity ui v Uniform electric and magnetic field exist in the region along y direction of magnitudes E and B respectively Then particle will definitively return to the origin if Answer A B Your Attempt vB 2TTE Rate this question u x 2 B TE Correct answer is an integer is an integer

express OI statements using quantifiers Then form the negation of the statement so that no negation is to the left of a quantifier Next express the negation in simple English Do not simply use the words It is not the case that a All dogs have fleas b There is a horse that can add c Every koala can climb d No monkey can speak French

positive direction of the x axis at a high velocity v f 2pp Fig 70 ed pressure propagating in the Fig 71 a K Fig 72 At the moment of arrival of the wave the pressure abruptly increases This dependence is plotted in Fig 71 Determine the velocity u acquired by a wedge immediately after the shock front passes through it The mass of the wedge is m and its size is shown in Fig 72 Friction should be neglected and the velocity acquired by the wedge should be assumed to be much lower than the velocity of the wave u v

A block A of mass 4 kg is placed on another block B of mass 5 kg and the block B rests on a smooth horizontal table If the maximum force that can be applied on A so that both the blocks move together is 12 N the maximum force that can be applied on B for the blocks to move together will be A 48 N B 27 N C 15 N D 25 N D

26 A particle moves along the x axis such that coordinate x varies with time t according to m then find initial velocity of X 1 the particle 1 m s 2 m s 3 1 m s 4 zero

8 Displacement s of a particle is related to time t as s at bt ct Where a b and c are constants of the motion The velocity of the particle when its acceleration is zero is given by b b b 1 a 2 a 2c 3 a 4 a 4c 38 satin s 444 1 4 4 2 you s at bt ct ia bais da u 1 a b b 2 a 3 a 4 a 2c 3c 4c

The force F needed to support the liquid of density p and the vessel on top in figure is H 1 2 tube area a h 25 FT Question Type Single Correct Type 3 Fixed pg ha Hh A pg H h A Frictionless massless piston of area A pg HA pgha

No 5 A beaker is completely filled with water at 4 C It will overflow if 1 2 4 heated above 4 C cooled below 4 C 1 2 both none of the above

In the diagram shown point O is real object Consider the point O to be the origin A concave lens of focal length 10cm is cut into two equal pieces and placed as shown What is separation between the two images formed The object is at a distance 20 cm from the lens A 2 3 cm C 2cm B 1 3 cm D None 1cm

In the figure 5 192 shown i 10e 2 A 12 4A and Vc 3e 2 V Find a i and V also plot the time functions of i and VL b Vac Vab and Vd also plot their time dependence curves cd a R 292 www be C 2F Vc O IL 1 R 202 W L 4H

alls off ock m with 2 76 A uniform rod of length L rests against a smooth roller as shown in figure 2 226 Find the friction coefficient between the ground and the lower end if the minimum angle that the rod can make with the horizontal is 0 Lcos sin 0 Figure 2 226 h bibel

9 A particle moves along a straight line such that its displacement at any time t is given by s t 31 10 m The displacement when the velocity becomes zero is 1 6 m 2 8 m 3 12 m 4 5 m 39 d d d se de este di you s t 31 10 m quid uide 1 6 m 2 8 m

8 The plates of a parallel plate capacitor are 10 cm apart and have area equal to 2 m 2 If the charge on each plate is 8 85 x 10 10 C the electric field at a point Oa between the plates will be zero Ob outside the plates will be zero c between the plates will be 25 N C d between the plates will change from point to point 2 points

4 82 A 44 gm bullet strikes and becomes embedded in a 1 54 kg block of wood placed on a horizontal surface just in front of the gun If the coefficient of kinetic friction between the block and the surface is 0 28 and the impact drives the block a distance of 18 m before it comes to rest what was the muzzle speed of the bullet Ans 360 m s C C t

280 4 70 Masses of the bodies A B and Care 1 kg 2 kg and 3 kg respectively There is no friction between the ground and the bodies Initially ball A is moving with a velocity 20 m s collides inelastically e 0 5 with the ball B which was initially at rest The ball B further collides elastically to the block C at rest and then C collides elastically to the wall in front Find the velocities of the three blocks after all collisions occurred B Figure 4 146 Ans v 9 4 m s VB 5 7 m s vc 2 4 m s circula of the minim mass r figure

A free alpha particle and a free proton are separated by distance of 10 10 m and are released The kinetic energy of alpha particle when at infinite separation is 1 28 6 x 10 19 J 3 36 8 10 19 J 2 9 2 10 19 J 4 12 5 10 19 J

In the figure shown the conductor is uncharged and a charge q is placed inside a sphere cavi at a distance a from its centre C A B C D Conductor Column l Electric field due to induced charges on the inner surface of cavity at point P Electric potential due to charges on the inner surface of cavity and q at P p Electric field due to induced charges r on the outer surface of conductor and Q at C Electric potential due to induced charges on the inner surface of cavity at C Column II Zero Non zero Value can be stated with the given data Value cannot be stated from the given data

FER INSTITUTE ARRYHANI 27 An object initially moves along x axis subjected to an acceleration a which varies with time 1 according to relation a 2x 5 If initial velocity of partical is 5m s then its velocity after 2 second will be 1 14 m s 2 2 m s 3 5 m s 4 19 m s

4 47 A small block of mass m is pushed towards a movable wedge of mass nm and height h with initial velocity u All surfaces are smooth The minimum value of u for which the block will reach the top of the wedge A 2gh C 2gh 1 h nm Figure 4 110 B 2gh 28h gh 1 1 D 2gh 1 U m

34 35 BL 1 4 m s 2 2 m s 3 2 m s 4 zero A particle is moving on x axis of a reference frame with x co ordinate varying with time t according to x 10 10t 1 then initial velocity of particle 1 5 m s 3 20 m s A boy walks to his school at a distance of 2 Zero 4 10 m s

1 A polished metal plate with rough black spot marked on it is heated to about 1500 K and quickly taken into a dark room Which of the following statement would be true 1 The spot appear darker than plate 2 Spot and plate will appear equally bright 3 The plate and spot will disappear in dark 4 The spot appear brighter than plate 11

The Network shown in figure is a part of the circuit The battery has negligible resistance R 222 E 12 V wwww L 5mH oooooooo I I At a certain instant the current I 2 A and it is decreasing at the rate of 10 As What is the potential difference between the points B and A IGUJ CET 2015 8 5 V A 8 0 V C 10 V LB B D 15 V

35 A boy walks to his school at a distance of 6 km with a speed of 2 5 km h and walks back with a constant speed by 4 km h His average speed for round trip expressed in km h is 1 24 13 2 40 13 3 3 4 4 8 36 A body starts from the origin and moves along

4 58 A wind powered generator converts wind energy into electrical energy Assume that the generator converts a fixed fraction of the wind energy intercepted by its blades into electrical energy For wind speed v the electrical power output will be proportional to A v C v B 2 D 14 4 64 towa infin be A C

4 63 A uniform solid right circular cone of base radius R is joined to a uniform solid hemisphere of radius R and of the same density so as to have a common face The centre of mass of the composite solid lies on the common face The height of the cone is A 1 5R B 3R D 2 3 R C 3R hi R Figure 4 117

in single slit experiment the first minima is formed at La mbda by 2 so please explain my option doesn t match with any of them 3300 angstrom 6600 angstrom 4400 angstrom 1100 angstrom In a single slit different experiment fist minimum for red light 660 nm coincides with first maximum of some other wavelength A The value of X is Xm n D d 660 nmy d X m M MIN 2n 1 A D d 27 d 660 x 2 3 0 nm

4 105 A chain of mass m and length rests on a rough surfaced table so that one of its ends hangs over the edge The chain starts sliding off the table all by itself provided the overhanging part equals 1 3 of the chain length What will be the total work performed by the friction forces acting on the chain by the moment it slides completely off the table Friction coefficient is i t

In a laboratory experiment 16 0 J of heat raised the temperature of a 199 g object from 25 0 C to 35 0 C What is the specific heat of the object 8 04 J kg K O 1600 J kg K O 0 00120 J kg K

4 51 A chain of length 0 5 TR placed on a smooth spherical surface of radius R with one of its ends fixed at the top the sphere The value of tangential acceleration of each element of chain when its upper end is released Rg RE 1 1 sin 2 A Rg C R 1 tan B D Rg 1 Rg 0 1 2 1 cos R COS 1 2 R 1 cot

4 88 A cannon of mass m starts sliding freely down a smooth inclined plane at an angle a to the horizontal After the cannon covered the distance I a shot was fired the shell leaving the cannon in the horizontal direction with a momentum P As a consequence the cannon is stopped Assuming the mass of the shell to be negligible determine the duration of the shot

2a 4 3b 3b 3b 3b 29 A particle is moving on a circular path with constant speed v What is the change in its velocity after it has described an angle of 90 4 2v 1 v 2 2 v 3 3 v 1 29

4 62 An alpha particle collides elastically with a stationary nucleus and continues on at an angle of 60 with respect to the original direction of motion The nucleus recoils at an angle of 30 with respect to this direction Mass number of nucleus is 8 B 4 A 2 C 8 D 6

4 83 A 4200 kg rocket is traveling in outer space with a velocity of 150 m s toward the sun It wishes to alter its course by 30 and can do this by shooting its rockets briefly in a direction perpendicular to its original motion If the rocket gases are expelled at a speed of 2700 m s what mass of gas must be expelled Ans 131 kg

Two coils P and Q are kept near each other When no current flows through coil P and current increases in coil Q at the rate 10 A s the e m f in coil P is 15 mV When coil Q carries no current and current of 1 8 A flows through coil P the magnetic flux linked with the coil Q is A 1 4 mWb C 2 7 mWb B D MHT CET 2017 2 2 mWb 2 9 mWb

125 m 15 A particle moves along the parabolic path y 2x x2 2 in such a way that the x component of velocity vector remains constant 5 m s Find the magnitude of acceleration of the particle 16 When two projectiles are fired from complementary angles having times of flight T T and maximum heights H H respectively which of the following is incorrect 2

String 1 is connected with string 2 The mass per unit length in string 1 is and the mass per unit length in string 2 is 4 The tension in the strings is T A travelling wave is coming from the left What fraction of the energy in the incident wave goes into string 2 string 1 Question Type Single Correct Type 1 1 8 2 4 9 string 2 3 2 3

A particle is projected horizontally with a 20 speed of 3 m s from some height at t 0 At what time will its velocity make 60 angle with the initial velocity 1 Question Type Single Correct Type 2 3 1 sec 2 sec 20 3 1 5 sec m s

3 A cylinder is wrapped around its lateral surface by a rope as shown in the figure The rope is moved upwards such that cylinder does not fall from its initial position Initially it was at rest What is the acceleration of the rope 1 g 3 3g 2 mg 2 2 g 4 DIN g

The efficiency of a carnot cycle on a monoatomic gas is 50 The lowest temperature during the cycle is 27 C If there are 3 mole of gas what is the change in its internal energy during adiabatic expansion during the cycle Question Type Single Correct Type 1 11 25 kJ 2 11 25 kJ 3 101 25 J

The frequency of revolution of electron in nth Bohr orbit is vn The graph between log n and log v v may be Question Type Single Correct Type 1 log v v 2 log n 2 K 3 log n log v v A A 801 log n V

0 If A and B are two non zero vectors suc that B AB and A 2 B the the angle between A and B is 1 37 2 53 3 cos 3 4 4 cos 4 3

4 46 A girl throws a ball with initial velocity v at an inclination of 45 The ball strikes the smooth vertical wall at a horizonta distance d from girl and after rebounding returns to her hand What is the co efficient of restitution between wall and ball A 2 gd gd B D gd v gd 12

B 6 A light inextensible cord tied at on one end to a peg A on a wall passes over a frictionless peg B fixed in level with the peg A and supports a load at the other end Between the pegs the cord is wearing a small ring of mass equal to that of the load Initially the ring is held in level with the pegs as shown in the figure and then released Determine acceleration of the ring when it passes an equilibrium position Acceleration of free fall is g

The angular separation between the 2 points central maximum and first order minimum of the diffractions pattern due to a single slit of width 0 25 mm when light of wavelength 5890 is incident normally on the slit is O 10 1 minute O 9 1 minute O 7 1 minute 8 1 minute

number 92 mass number 238 and atomic number 90 a batsman deflects a ball by an angle of 45 without changing its initial speed which is equal to 54 km hr what is the impulse imparted to the ball mass of the ball is 0 15 kg O4 16 ns O10ns O2 16 ns O 40ns