Basic Physics Questions and Answers

Give reasons 4 Ozone layer is a protective shell of earth Microbes in soil get distroyed 2 Answer the following questions 3 Explain with help of diagram how soil is formed Write difference between Living and non living thing Plants and animals

3 45 Q 187 In the given circuit 4 A steady current enters int the network The charge stored on plate B of the capacitor is 4 A 1 8 C 3 16 C wwww 39 X www 592 www 522 A 4 F TB I Y wwww 39 4 A 2 8 C 4 16 C 1 CV 3 CV 192 When batter conductor AB conductor is battery of em electrons will

A particle having charge q and mass mis projected with velocity v 21 3j in uniform electric field Ej Magnitude of change in momentum during time interval t is 13mt Eo 43 qEot m qEot Zero

This section contains 35 SIN O 3T The period of oscillation of a magnet in earth s field is T The period of oscillation when an extra field twice of the earth s field is applied in the same direction is 2T Read More O 3T questions Each question has 4

For a body thrown horizontally from the top of tower h height v velocity of projection A the time of flight depends both on h and v B the horizontal range depends only on v but not on h C the time of flight and horizontal range depends on h but not on v

23 A 20 C charge is kept at centre of a square as shown in the figure The work done in moving a charge 2 C from point D to B is 7 C 1 18 x 10 J 3 72 10 3 J D 1 A 20 C 2 36 10 J 4 Zero

person swims at 30 with normal to river flow to meet target on reaching opposite point The ratio of river water velocity to the person s velocity is A 3 2 B 2 3 C 1 2 L 1

A small block of mass m 1kg is attached with one end of the spring of force constant K 100Nm Other end of the spring is fixed to a rough plane having coefficient of friction 0 2 The spring is kept in its natural length by an inextensible thread tied between its ends as shown in Figure If the thread is burnt calculate the elongation of the spring when the block comes to rest for the first time g 10m s 0 8 37 4 cm 8 cm 12 cm Clear Respc

28 Select incorrect statement 1 Similar point charges always repel each other 2 Similar charged bodies always repel each other 3 Similar charged bodies may attract each other 4 Clouds get charged by friction

A current carrying conductor of length I is bent into two loops one by one First loop has one turn of wire and the second loop has two turns of wire Compare the magnetic fields at the centre of the loops

A particle at end of a spring executes simple harmonic motion with a period t while the corresponding period of another spring is t If two springs are connected in series then time period is T them which one is true Consider same mass of particle in all cases A B T t t2 T 1 1 CT t 1 T Correct Answer My Answer

the radial velocities of distant galaxies Example 10 1 What speed should a galaxy move with respect to us so that the sodium line at 589 0 nm is observed at 589 6 nm Av ll changes in v and 2 For

0 Stal electric flux through a closed surface enclosing a charge is equal to 1 Eo times the magnitude of the charge enclosed Assertion A Positive charge always moves from a higher potential point to a lower potential point Reason R Electric potential is a vector quantity

Two conducting plates have charge 3Q and 2Q and separation between them is x then potential difference between the two plates is plate area is A 3Q 2Q 1 A o 21 X X Q 2 2A o 3Q 4 X

Two forces act on an object of mass M 4 00 kg as shown in the figure Because of these forces the object experiences an acceleration of a 8 00 m s in the positive x direction If 0 30 0 calculate the magnitude of F2 given that F 20 0 N F N M 0 1

21 An object 1 5 cm in size is placed on the side of the convex lens in the arrangement with a concave lens the distance between two lenses is 8cm The distance between the object and the convex lens is 40cm Determine the magnification produced by the two lens system and the size of the image The focal length of concave lens

Two simple harmonic motions are represented by the equations Y 0 1 sin 100nt y2 0 1 cos 100nt The phase difference of the velocity of particle 1 with respect to the velocity of particle 2 is A B C C w k 6 k 3 75 6 My Answer Correct Answer

3 between 0 and v 4 between U and The magnitude of average acceleration in half time period from equilibrium position in a simple harmonic motion is 1 2Am TC max 2 2 Aw 21 Aw 2T max 1952 4 Zero 3 tadionlacement y its potential energy is E and at a displacement y

A body is executing simple harmonic motion At a displacement x its potential energy is E and at a displacement y it potential energy is E The potential energy E at a displacement x y is 1 E E 2 E E 3 E E 2 E E 4 E E

3 I sec 4 0 5 sec A particle is oscillating freely with a natural frequency w and amplitude a It is later subjected damping force proportional to its velocity and keeps oscillating with a frequency oo Which of the follow statement is true RPMT 20 1 and the amplitude is not affected 3 and the amplitude remains the same 2 w w and the amplitude decreases with time 4 0 and the amplitude keep decreasing with time

21 Two pendulums at rest start swinging together Their lengths are respectively 1 44 m and 1 m They will again start swinging in same phase together after of longer pendulum 1 1 vibration 3 4 vibrations 4 5 vibrations imple nendulum as T in a lift at rest If the lift moves up with acceleration as 2 3 vibrations

The oscillation of a body on a smooth horizontal surface is represented by the equation X A cos cot where X displacement at time t frequency of oscillation Which one of the following graph shows correctly the variation a with t 1 180 Tt 2 AIPMT 2014 H M H Tt 3 4

1 10 cm 2 20 cm 17 32 Two particles execute S H M of same amplitude and frequency along the same straight line from same mean position They cross one another without collision when going in opposite directions each time their displacement is half of their amplitude The phase difference between them is 1 0 2 120 3 180 4 135 in thon correct graph for acceleration a and corresponding linea 5 100 1 x 95

4 time period and displacement At how many maximum points velocity of simple pendulum is same 1 1 2 2 3 4 4 6 The velocity of a particle in S H M at displacement y from mean position is a amplitude o a IN

A block of mass m initially at rest is sliding up in vertical direction against a rough vertical wall with the help of a force F whose magnitude is constant but direction is changing 8 Bot where t 71 The value of F so that the block comes to rest when 2 is time in sec At t 0 the force is in vertical upward direction and then as time passes its direction is getting along normal i e 0 0 74 2 is

1 Increases 2 Decreases The mass and diameter of a planet are twice those of earth The period of osillation of pendulum on this planet will be If it is second s pendulum on earth 2 2 2 sec 1 sec 3 2 sec 4 sec

1 0 A mass M is performing linear simple harmonic motion then correct graph for acceleration a and corresponding line velocity v is M 85

6 Three identical resistors R R R are as shown to a battery of constant e m f The power dissipated is P www R R 1 The least in R 2 Greatest in R 3 In the ratio 1 2 in resistance R and R respectively 4 The same in R and in the parallel combination

21 5 A spring of force constant k is cut into lengths of ratio 1 2 3 They are connected in series and the new for constant is k Then they are connected in parallel and force constant is k Then k k is 1 1 9 NEET 201 2 1 11 4 1 6 3 1 14 ufficiently high building and is moving freely to and fro like a simple harm

A mass M is suspended from a light spring An addtional mass mass added displaces the spring further by a distance x Now the combined mass will be oscillate on the spring with period 2 T 2 M m x mg 2 2 4 T 2 M m mgx 1 2D 1 T 2 mg x M m m 3 T n 2 mg x M m

Which of the following statements is not true In the case of a simple pendulum for small Teme perio 1 Directly proportional for square root of the length of the pendulum 2 Inversely proportional to the square root of the acceleration due to gravity 3 Dependent on the mass size and material of the bob 4 Independent of the amplitude

9 For a compound pendulum the maximum time period is L 2k 2 2 3 Zero 4 Infinite g g ring of radius R is suspended from its circumference and is made to oscillate about a horizontal axi 0 Np 3NR 1 2

A simple pendulum has some time period T What will be the percentage change in its time period if its amplitud decreased by 5 1 6 4 0 2 3 3 1 5

A simple pendulum is set up in a trolley which moves to the right with an acceleration a on a horizontal plane Then th thread of the pendulum in the mean position makes an angle 0 with the vertical due to the hosendo force a 1 tan in the forward direction 3 tan in the backward direction 3 a in the backward direction 2 tan 4 tan 18 in the forward direction

For a particle executing simple harmonic motion the acceleration is proportional to 2 distance from the mean position displacement from the mean position 3 distance travelled since t 0 4 speed

A thin rod of length 1 m is suspended from its end and is made to oscillate in a vertical plane The distance between point of suspension and centre of oscillation will be 1 m 3 2 m 3 1m 4 2 3 m

15 0 119 Acceleration a versus time t graph of a body in SHM is given by a curve shown below T is the time peirod Then corresponding graph between kinetic energy KE and time t is correctly represented by KE 1 h 3 KE V a XI KE 4 KE y alvin 4 1 a1

motion is S H M with amplitude a 2 4 The motion is S H M with amplitude 2a The resultant of two rectangular simple harmonic motions of the same frequency and unequal amplitudes but differ in phase by n 2 is 1 Simple harmonic 4 Parabolic 2 Circular 3 Elliptical

2 Coefficient of linear expansion of material of resistor is a Its temperature coefficient of resistivity and resistance are a and a respectively then correct relation is 1 r 3 3 2 4 Rap OL 3a

Attenuation of the x rays that penetrate through the body tissues which depends on I The tissue type II The intensity of the beam III The thickness of the tissue O I and III only O II and III only O I only O I II and III only

CP Simple Harmonic The potential energy of a particle with displacement X is U X The motion is simple harmonic when K is a positive constant KE 1m wy BE 2 U KX DU KX 2 A2 A2 to Im 3 U K 4 4 U KX onic motion will be equal when

A disc of radius R is suspended from its circumference and made to oscillate Its time period will be R 2 3R 1 2T 2g In the above question its length equivalent to a simple pendulum will be 2 2 2 t 4R 2 R 3 2T 3 R 3R 2 4 2 4 2R 2R g

6 In the compound pendulum the minimum period of oscillation will be 20 1 2T k g 2 2 l g 2k 3 2 4 2T lum from its centre of gravity is f the time period of oscillation

In a 18 cm long capillary tube water rises upto 16 3 cm height If tube is cut at a height of 12 cm then RPMT 20 1 Water will eject out as fountain from capillary tube 2 Water will remain at 12 cm in capillary tube 3 Height of water in capillary tube will be 10 3 cm 4 Level of water will fall down from capillary tube

A cylinder with a movable piston contains air under a pressure p and a soap bubble of radius r The pressure p to which the air should be compressed by slowly pushing the piston into the cylinder for the soap bubble to reduce its size by half will be The surface tension is o and the temperature T is maintained constant 1 SP 240 8p r 3 2p 240 240 2 4p 4 2p r 120

60 A man stands in the middle of a rotating table which has an angular velocity w He is holding two equal masses at arms length in each hand Without moving his arms he just drops two masses vertically on table The new angular velocity O will be greater than w O will be less than w Will not change min sec Will increase or decrease depends on initial angular momentum

A second s pendulum is placed in a space laboratary orbiting around the earth at a height 3R where R is the radius the earth The time period of the pendulum is dist 1 zero 2 2 3 sec ar En 3 4 sec guillo ad inc 4 Infinite

A player caught a cricket ball of mass 200 g which was moving at velocity of 2 ms If catching process was completed in 0 1 s the force exerted by the ball on the hands of player is 20 N O 40 N O 30 N 80 N

A particle starts S H M from the mean position Its amplitude is A and time period is T At the time when its speed is half of the maximum speed its displacement Y is 1 4 1 2 2 A 2 3 A 3 2 2A 4 3

A thin metal disc of radius r floats on water surface and bends the surface downwards along the perimeter making a angle with vertical edge of the disc If the disc displaces a weight of water W and surface tension of water is T the the weight of metal disc is 1 2 rT W 2 2 rT cose W 3 2x rT cose W 4 W 2n rT cose