Basic Physics Questions and Answers

A flywheel at rest is to reach an angular velocity of 24 rad s in 8 second with constant angula cceleration The total angle turned through during this interval is A 24 rad C 72 rad B 48 rad D 96 rad

When a battery is connected to a Ptype semiconductor with a metallic wire the current in the semiconductor predominantly inside the metallic wire and that inside the battery respectively due av det nya udah ane puoden afe BRI BURE S RG B12 687 OPTIONS MARK FOR REVIEW CLEAR SELECTION OA B Holes electrons ions Gia Seaca Holes ions electrons IL R Electrons ions holes HREE WITH

GRAPH SUMS A long solenoid has 500 turns When a current of 2 ampere is passed through it the resulting magnetic flux linked with each turn of the solenoid 4 x 10 Wb The self inductance of the soler a 1 0 henry c 2 5 henry b 4 0 henry d 2 0 henry

4 All of these A planet of mass m revolved around the sun of mass M in an elliptical orbit The maximum and minimum distance of the planet form the sun are r and 3r respectively The time period of the planet is proportional to NCERT Pg 184 1 3 2r 2 4 4r 3 4r Two point masses m and 9m are separated by a distance d on a line A third point mass 5 10 mN IT 3 30 4 mN 2 4 Three equal masses of at the vertices of an equil The gravitational force a placed at the centroid of 1 Zero 2 6 67 x 10 3 N 3 9 10 9 N

18 A bullet of mass 10 gram is fixed with speed 19 A solid disc of radius 10 horizontal table rough of 500 m s into a door and gets embedded exactly at centre of door The door is 1 m wide and weighs 12 kg Door is hinged along one side and rotates about vertical axis without friction The angular speed of door just after bullet embeds into it is NCERT Pg 180 1 0 35 rad s 1 2 0 625 rad s 1 3 0 255 rad s 1 speed equal to 10 rad kinetic friction between c then time taken by the rolling will be 2 3 T S

20 A child stands at centre of turntable with his two arms outstretched The turntable is set rotating with angular speed of 40 rad s 1 What will be angular speed of child if he folds his hands back reducing moment of inertia times the initial value ignore friction NCERT Pg 180 to 5 1 50 rad s 1 2 75 rad s 1 3 100 rad s 1

3 The rate constant is numerically the same for three reactions of first second and third order respectively Which one is true at a moment for rate of all three reactions if concentration of reactants is same and greater than 1 M 2 r T 13 r 1 r r 13 2 3 r r 4 All

15 If vector A and B have an angle 9 betweer them then value of will be JA 0 2 1 2 cos 2 2 tan 2 2 2ABSin 0 3 2 sin 2 4 2 cot 2 A horizontal force of 100 N is necessary to just

A ball of mass m moving with a speed 2vo collides head on with an identical ball at rest If e is the coefficient of restitution then what will be ratio of velocity of two balls after collision estion Type Single Correct Type 1 2 3 1 e 1 e 1 e 1 e e 1 e 1 e 1

An electron beam has a kinetic energy equal to 100 e Find its wavelength associated with a beam if m of electron 9 1 x 10 31 kg and 1 eV 1 6 x 10 Planck s constant 6 6 x 10 34 Js a 24 6 A c 1 2 b 0 12 d 6 3

Question No 2 Attempt All 35 questions When a mass of 2 kg is suspended slowly by a spring with its upper end fixed to the ceiling the spring stretches by 1 cm Work done by the spring is g 10 ms O 02J O 0 1J O 04J Marks For Correct Answer O None of these

A uniform magnetic field exists in region given by 8 37 47 5k A rod of length 5 m which is placed along y axis is moved along x axis with constant speed 1 m sec Then induced em f in the rod will be OPTIONS MARK FOR REVIEW del 1 m secx Fria de San CLEAR SELECTION A B Zero K 25 volt 25 lee

In the following first order reactions A Reagent Product B Reagent Produc Calculate the ratio of K K 50 of B has been reacted when 94 of A has been reacted 1 4 06 3 2 06 2 0 246 4 0 06

A bullet of mass 10 g travelling at a speed of 500 ms 1 strikes a block of mass 2 kg which is suspended by a string of length 5 m The centre of gravity of the block is found to rise a vertical distance of 0 2 m What is the speed of the bullet after it emerges from the block 1 100 m s 2 150 m s 3 50 m s 4 250 m s

A particle of mass 2kg is thrown upward with a speed 10m s It returns to the same point with a speed of 8m s If magnitude of the force of air resistance is constant find the maximum height reached by the particle estion Type Single Correct Type 1 2 3 4 2 1 m 3 1 m 4 1 m 5 m

the plates of the capacitor now be A charge 200 C is imparted to each of the two identical parallel plate capacitors connected parallel At t 0 the plates of both the capacitors are 0 1 m apart The plates of first capacitor move towards each other with velocity 0 001 m s and plates of second capacitor move apart with the same velocity Find the current in the circuit

Attempt All 35 questions Which of the following is incorrect related to energy of a satellite OT E KE KE PE 2 B E T E I None of these

2 A thin circular ring of mass M and radius r is rotating about 12 f m segura a favor and act garam a afe 319 an axis passing through its centre and perpendicular to its plane with a constant angular velocity Two objects each of mass m are attached gently to the opposite ends of a diameter of the ring The ring now rotates with angular velocity fara fra tutta qui fa ufafa fa veden arraf at a 1 M 2m M 2m 2 M M m 3 4 M 2m M COM M 2m 7 1 M 2m M 2m 2 COM M m 3 4 co M 2m M COM M 2m

A plane is in level flight at constant speed and each of its wings has an area 10 m If the speed of air on upper and lower surfaces are 80 m s and 70 m s respectively then the mass of the plane is g 10 m s and Pair 1 kg m 2500 kg 1500 kg 3000 kg 4000 kg

Question No 26 Attempt All 35 questions Which of the following is incorrect related to energy of a satellite O TE KE PE 2 O B E IT E I O KE O None of these

In the the arrangement shown in figure coefficient of friction between the two blocks 1 is 2 The force of friction acting between the two blocks is Assuming ground is frictionless F 2N 1 Question Type Single Correct Type 2 3 8 N 10 N F 20N 6 N 2kg 4kg

3 100 3N 10 Which 4 120 N of the following statement is of the NCERT Pg 163 incorrect 1 Moment of inertia depends on distribution of mass about rotational axis 2 Moment of inertia depends on orientation and position of axis of rotation 3 Moment of inertia changes when angular velocity of body changes 4 Flywheel resists sudden increase or decrease of speed of vehicle 1 A ring has mass of 6 kg and radius of 2 m 13 40 cm 100 J 2 10 4 4 1 10 33 rad s 3 20 66 rad s A cord of negligible mass is a solid cylinder of a mass 2 20 cm A steady pull of 25 cord tangentially The cylind horizontal axis with frictic What is kinetic energy of w cord is unwound 1 50 J

A block of mass 4 kg is kept on the ground The coefficient of friction between the block the ground is 0 8 An external force F 30N is applied on the block parallel to the ground The resultant force exerted by the ground on the block is Question Type Single Correct Type 1 2 3 40 N 30 N 50 N

In the circuit shown in figure initially switches S and S were closed and S3 was open Now the switches S and S are opened and S3 is closed The total heat dissipated by the 10 Q resistor is S 20 V 392 2 uF 0 90 mJ 0 45 mJ x 1 25 mJ 250 ml 10 92 S3 S 10 V 252 2 F T

An object of volume 0 5 m and density 500 kg m is glued to t bottom of a vessel containing water The flat base of the object g the bottom has an area 100 cm and density of water is 1 0 g cm maximum force that the glue can withstand is 2000 N to maximum height above the base can water be filled in the vessel the object is not torn apart from the base a 5 m c Up to any height b 10 m d Insufficient information

The direction of frictional force acting on A as shown in the figure will be surface betw rough A 2 m s B OPTIONS 10 m s MARK FOR REVIEW CLEAR SELECTION A Rightwards 4 B Leftwards C Upwards

In Young s double slit experiment fringe order is represented by m then fringe width is 1 Independent of m 2 Directly proportional to m 3 Directly proportional to 2m 1 4 Inversely proportional to 2m 1 1

A 102 resistance in series with an ammeter is balanced by 75 cm of potentiometer wire A standard cell of emf 1 02 V is balanced by 50 cm The ammeter shows a reading of 1 5 A Then the error in ammeter reading is EAMCET 2015 d 0 3 A a 0 03 A b 3A c 1 3 A in 10 Y and its internal

24 In the figure an air lens of radii of curvature 10 cm R R 10 cm is cut in a cylinder of glass 3 2 The focal length and the nature of the len is Air Glass 1 15 cm convex 2 15 cm concave 3 neither concave nor convex

8 Which of the following statement is incorrect NCERT Pg 158 1 Moment of couple is independent of point about which moment is taken 2 For translational equilibrium of a body vector sum of all the forces on it must be zero 3 A body may be in translational equilibrium but may not be in rotational equilibrium simultaneously Rotational equilibrium depends on location of origin about which torques are taken J mnmo mnimd 6 5 2

Q 11 In the circuit shown resistance reactance of R L and C are 40 92 80 2 and 50 2 respectively The supply emf is 250 V 50 Hz AC The RMS current flowing in the circuit is 1 5 2 A 2 5 A 5

12 Two particles are fixed on an x axis Particle 1 of charge 40 C is located at x 2 0 cm particle 2 of charge Q is located at r 3 0 cm Particle 3 of charge magnitude 20 C is released from rest on the y axis at y 2 0 cm What is the value of Q if the initial acceleration of particle 3 is in the positive direction of a the x axis and b they axis 13 Go In Fig 21 26 particle 1 of

7 The angular momentum of a particle of mass 0 5 kg about point O at the instant as shown in the figure is 2 m 1 6 kgm s 1 29 kgm s 1 3 18 kgm s 1 NCERT Pg 158 v 6 3 m s 60 m 0 5 kg 27 nmo hnt md

08 19 1 In the combination of the following gates the output Y can be written in terms of inputs A and B as H OF LOGIC GATES a A B c A B A B b A B A B d A B

A person in an elevator accelerating upwards with an acceleration of 2 m s 2 tosses a coin vertically upwards with a speed of 20 m s 1 After how much time will the coin fall back into his hand g 10 m s ms 2 uestion Type Single Correct Type 1 2 53 3 3 S 10

ed ation 0 11 60 165 BOTANY 12 A vector A 2 3 It is given that A B 2 3 Then B is OPTIONS MARK FOR REVIEW CLEAR SELECTION A 2 3j B Null vector C 4 6

The refractive index of the material of a p is 2 and the angle of the prism is 30 C the two refracting surfaces of the prism is a mirror inwards by silver coating A be monochromatic light entering the prism from other face will retrace its path after ref the silvered surface if its angle of inci prism is a 60 b 45 c 30

Three blocks A B and Cwith masses as shown in the figure hang through strings The tension in topmost string is g 10 m s A 1 kg B 2 kg C 3 kg OPTIONS MARK FOR REVIEW CLEAR SELECTION OA 30 N B 20 N

A transmitting antenna at the top of a tower has a height 32 m and the height of the receiving antenna is 50 m What is the maximum distance between them for satisfactory communication in mode Given radius of earth 6 4 106 m

A 1 kg block moves towards a light spring with a velocity of 8 m s When the spring is compresed by 3 m its momentum becomes half of the original momentum Spring constant of the spring is uestion Type Single Correct Type 1 2 3 18 3 N m 16 3 N m vooo 3 N m

Consider a parallel plate capacitor filled with a dielectric of relative permittivity 2 One of the plates has charge density while other has charge density o Assume that the points are not too near the edges of the plates The magnitudes of the electric field at points P and P respectively are a P

Which of the following statement is true Gravitational forces have finite range of the order of 10 to 106 m Weak nuclear forces acts between all charged particles Strong nuclear forces acts between nucleons Electromagnetic force have finite range and acts between all elementary particles

The answer to each question is a SINGLE DIGIT INTEGER ranging from 0 to 9 both inclusive Marking scheme o 4 If the correct integer is typed in the provided space o 0 In all other cases If displacement of a particle moving in straight line is given by t 12t where t is time in sec and is in meter The acceleration of the particle when velocity of the particle is zero is 4Pin S I units Find the value of P

The brakes applied to a car produce an acceleration of 6m s 2 in the opposite direction to the motion If the car takes 2 s to stop after the application of brak es calculate the distance it travels duri ng this time In this question we use the second equ ation of motion s ut 1 2at 2 A train is travelling at a speed of 90 k m h Brakes are applied so as to produ ce a uniform acceleration of 0 5m s 2 Find how far the train will go before it i s brought to rest In this question we use the third equati on of motion why we cannot use the second equation of motion In this ques

55 A force P 3mg acts on a block of mass m at an angle of 30 with horizontal The friction force between the block and ground assuming coefficient of friction between the contacting surface is P 3mg 1 Zero 3 3 3mg 2 E 30 2 2 mg 4 None of these on a rough horizontal surface The minimum force required to slide the block is

The density of a cube is measured by measurin its mass and length of its sides If the maximur error in the measurement of mass and lengths are 3 and 2 respectively the maximum error in the measurement of density would be a 12 b 14 c 7 d 9

The coefficient of static friction s between block A of mass 2kg and the table as shown in figure is 0 1 What should be the maximum mass of block B so that blocks do not move The string and the pulley are assumed to be smooth and massless g 10 m sec 2kg A uestion Type Single Correct Type 1 0 2 kg 2 0 4 kg 3 2 0 kg B

4 70 The time period of a bar magnet oscillating in a uniform magnetic field is 3 seconds if the magnet is cut into two equal parts along the equatorial line of the magnet and one part is made to vibrate in the same field what is the time period Ans T 2 I MH

A vessel has 10 g of hydrogen gas at pressure P and temperature 400 K A small hole is made in it so that hydrogen leaks out How much hydrogen leaks out if the fina 3 pressure becomes half and temperature becomes th of its previous value O 1 g 10 g 4

It is necessary to illuminate the bottom of a well by reflected solar beam when the light is incident at an angle a 40 to the vertical At what angle to the horizontal should a plane mirror be placed a 70 b 20 c 50 d 40