Physics Questions

2 10 6 N m 4 16 3 N m 3 40 N m 13 A scientist claims to have developed efficient engine while 13 working between 27 C and 327 C Then efficiency of engine will be 1 70 2 60 1 70 3 56 506 Ti74 4 40 3 56 d 4 The value of acceleration due to gravity g at a depth d s 14 one third of its value on the earth s surface The value of dis DE Uo R 10 be d 1 24 N m 3 40 N m 270 Seat RS d 1

Accordig to VBT which of the following overlapping results type covalent bond in O molecule formation when Z axis is internuclear axis II 2p 2p IV 2p 2p 1 25 25 V 2p 2p A I III B IL V C II IV III 15 15

2 10 1 3 30 In the situation shown the potential difference across 30 the cell of smaller e m f is 1 2 V 3 Zero 12 V 192 www 10 V www i 192 222 2 4 V 4 6 V I fas 2 E IX LL 2 E 7 1 10 E 2i 12 28 22 12 2G 1 3 16

1 has no written records b Modern Prehistory 2 Pottery and jewellery are a tools 2 b paintings 3 The Indus Valley Civilization is a part of b medieval a ancient b Indus 4 The Indus Valley Civilization flourished on the banks of the river a Nile c Hwang Ho 5 The site of Kalibangan is in a Gujarat b Rajasthan c History mus c artefacts India c modern c West Bengal Write T for true and F for false 1 There are many written records of the prehistoric period 2 Indian history is divided into three periods 3 The Indus Valley Civilization was a part of medieval India 4 The people of Indus Valley made terracotta figures

Velocity v versus time t graph of a particle moving tan a tan then average speed of the particle till the time its velocity becomes zero is v m s in a straight line is shown in the figure If 4 B t s 2

A convex lens of focal length 10 cm can pro duce a i magnified virtual image ii magnified real image If yes then where shall the object be placed in each case for obtaining these images Explain using di agrams

A small block of mass 1 kg is being moved with constant speed of 10 m s on a typical path in a x y vertical plane whose equation is y The coefficient of friction between the block and path is 0 01 Find the magnitude of power dissipated by frictiona force in watt at x 2 m 30 10

The resistance of platinum wire at 0 C is 22 05 and at 100 C it becomes 22 70 When the wire is heated to a temperature of t C the resistance of wire becomes 24 912 The value of t is 1 220 2 440 3 310 4 550 1 2 3 4

A simple pendulum with a metallic bob has a time period T The bob is now immersed in a non viscous liquid and oscillated If the density of the liquid is 1 4th of the metal what will be the time period of the same pendulum now

44 A current loop of area 0 01 m and carrying a 2 current of 10 ampere is held perpendicular to a mag netic field of intensity of 0 1 tesla The torque in N m acting on the loop is a 0 c 0 01 b 0 001 d 1 1 CBSE PMT 1994

3 A disc of radius R has a light pole fixed perpen dicular to the disc at the circumference which in turn has a pendulum of length R attached to its other end as shown in figure The disc is rotated with a constant angular velocity w The string is making an angle 30 with the rod Then the angular velocity w of disc is A 3g R 1 2 1 2 R B R 30 3g 2R 1 2 2g 2

A rod of length is pivoted at one of the ends 18 and is made to rotate in a horizontal plane as shown in figure with a constant angular speed A ball of mass m suspended by a string of length from the other end of the rod If the angle made by the string with the vertical is 6 then angular speed of rotation is 1 3 1 sin 0 g tan 0 1 sin 0 2 4 cos 0 m g cot 0 1 cot 0 fa af de 3 qui fait qe e ai t gi n i Herial l m Zour i ra i 1 3 g 1 sin 0 a f t u y c g st un fond oft and g tan 0 1 sin 0 2 4 g cos 0 m g cot 0 VE 1 cot 0 qui

A body of constant mass m 1 kg moves under variable force F as shown If at t 0 S 0 and velocity of the body is 20 m s and the force is always along direction of velocity then choose the incorrect options boboig 16JP110144 S 10 N F N mont bos doome is savo grigned anopisyd ballug ai gante en to 2m S m 6m A velocity of the particle will increase upto S 2m and then decrease B the final velocity at S 6 m is 10 m s mas C the final velocity at S 6 m is 4 5 m s the acceleration is constant up to S 2m and then it is negative DRZW option Kaise hoga Ye Do o

Read More Two points N and S are located in the northern and southern hemisphere respectively on the same longitude Projectiles P and Q are fired from N and S respectively towards each other Which of the following options is correct for the projectiles as they approach the equator Both P and Q will move towards the east Both P and Q will move towards the west P will move towards the east and Q towards the west

Continuing with the situation if the force F 80 N is directed vertically as shown the acceleration of the 1 kg block will be T A 2 m s2 towards right C 6 m s towards left 10 kg C 0 6 Smooth Rods are light 15 kg light rods xxx mmmmmmmmrus B 2 m s towards left D 16 5 m s towards right F 80 N

Z 13 46 In the Boolean algebra AB A equals to 1 A B 2 A 3 B 4 A B Z 13 4 A 2 13 PCP Sikar 204 Propulsive PTS to 8 b WIT JEE 2 13 A 2 25 2 13 3 46 from t 2 A 3 A B

17 AB is a potentiometer wire of length 100 cm and resistance 10 ohms It is connected in series with a resistance R 40 ohms and a battery of e m f 2 V and negligible internal resistance If a source of unknown e m f E is balanced by 40 cm length of the potentiometer wire the value of E is 1 0 8 V A R wwwwww 12V 40 cm E 1 B 2 1 6 V

8 V 6 V F 292 ww 292 www R www 1 7 A 2 10 A 3 2 A 4 8 A 13 When a metal conductor connected to right gap of meter bridge is heated the balancing point from left end NCERT Pg 120 1 Shifts towards left 2 Shifts towards right 3 Remains unchanged 4 Shift to zero position 14 Resistance P Q S and R are arranged clockwise cyclic order to form a wheatstone bridge The ratio of electric power consumed in the branches P Q and R S is INCERT Pg 109 1 1 1 ical IIT sh andatio 15 A battery of e m f 5 V and negligible internal resistance is connected across the diagonally opposite corners of a cubical network consisting of 12 resistors of network each of resistance 1 2 The current along one edge of the cube is NCERT Pg 116 1 1 A 2 2 A 3 3 A 4 4 A A Four arms of wheat stone bridge have the following resistances AB 60 2 BC 100 CD 60 2 DA 12 2 A galvanometer of 15 2 is connected across BD Calculate the value of additional resistance connected across CD to balance the bridge NCERT Pg 119 1 12 02 3 182 60 2 HH 5 V 1292 NCERT Maps 100 2 G 150 60 2 2 150 4 30 2

SolveLancer Test A radioactive medicine is to be given to a plant at 8 30 AM A solution of this was prepared at 6 40AM and 10 mL of this solution was to injected The scientist got stuck in traffic and arrived at office at 9 25 AM How much does should be given to plant t 1 hr 50 min SolveLancer Test a 10 mL b 20 mL c 14 1 mL d 7 07 mL CO a D b

A uniform semicircular disc of mass M anc radius R hinged at point O a shown in figure is released from rest from a vertical position as shown If the initial magnitude of angular than the xg 3 TR value of x is Center of mass is at a distance 4R from center of disc 3 acceleration of the disc is R

Two blocks of mass 1 kg and 2 kg respectively are connected by a spring and kept on a frictionless table The blocks are pulled apart so that the spring is stretched and released from rest At a certain instant of time the block of mass 1 kg is found to be moving at a speed 2 m s What must be the speed of the other block at this instant O 1 m s O O 0 5 m s 4 m s 0 25 m s

Figure shows the graph of x coordinate of a particle moving along x axis as a function of time Average velocity during t 0 to 6 s and instantaneous velocity at t 3 s respectively will be m 20 10 X 0 1 2 3 4 5 6 1 10 m s 0 t s 2 60 m s 0

3 Assume that scientists have discovered a new force measured in Newton say F between any two objects They found that the force is proportional to the densities of the two objects and inversely proportional to the square of distance between them So the equation looks d d like Fp K where d d2 are densities of the objects and r is the distance between them 72 Suppose the dimensions of K are M L Tc Then a b c

29 A bus of mass 1000 kg has an engine which produces a constant power of 50 kW If the resistance to motion assumed constant is 1000 N The maximum speed at which the bus can travel on level road and the accel eration when it is travelling at 25 m s will respectively be A 50 m s 1 0 m s B 1 0 m s 50 m s C 5 0 m s 10 m s D 10 m s 5 m s2

Two identical non conducting solid spheres of same mass and charge are suspended in air from a common point by two non conducting massless strings of same length At equilibrium the angle between the strings is a The spheres are now immersed in a dielectric liquid of density 800 kg m and dielectric constant 21 If the angle between the strings remains the same after the immersion then A C electric force between the spheres remains unchanged electric force between the spheres reduces mass density of the spheres is 840kgm the tension in the strings holding the spheres YOU MARKED X YOU MARKED

9 The sum of magnitudes of two forces acting at a point is 16 N Their resultant is 8 3 N and is at 90 with the force of smaller magnitude Calculate the magnitude of the smaller force in Newton

other part will move with speed 1 20 m s 2 10 13 m s 3 50 m s 4 30 m s A ball of mass m approaches a wall of mass 22 M m with speed 4 m s along the normal to the wall The speed of wall is 1 m s towards the ball The speed of the ball after an elastic collision with the wall is 1 5 m s away from the wall 2 9 m s away from the wall 3 3 m s away from the wall 4 6 m s away from the wall 1 20 m s 3 50 m s 34 2 1 5 2 9 3 3 4 6 2 10 13 m s 4 30 m s Mar ai a a dar ga

A FireFighting Vehicle is moving with a certain velocity at speed V on a straight track The dimensions of the vehicle is 30 cm in length 20 cm in breadth and 30 cm in height The weight of vehicle is 3 KG in total including 1 liter of filled water tank The water cannon is spraying water at rate Q in the up and down direction Find a scientific relation in equation format so that vehicle maintains stability while moving and spraying water simultaneously V 2 30cm water cannon moving up down 30cm height

3 A uniform solid sphere of mass M and radius r shown in the figure slips on a rough horizontal plane At some instant it has translational velocity vo 25 vo and rotational velocity about the centre Find the translational velocity after the sphere starts pure rolling 5 1 7 0 V 25 V S 2 6 7

Two wire A and B of copper have equal masses and the lengths are 10 cm and 20 cm respectively If resistance of A RA be RA and B be RB then the value of is RB 1 21 12 2 2 3 1 1 4 4 4 1 2 3 4

41 A vertical ring of radius r is made of a uniform wire of resistance R It slips vertically between two frictionless and resistanceless vertical rails There is a uniform magnetic field B perpendicular to plane of ring and rails as shown in figure When the speed of ring is v then the current in section PQ at that NBvr 2R instant is R 2pr da 2 fa 2 1218 201 Value of N is XXX XXXX XXXX X X X X 2P 9s a va R TT d ell

127 A drop of water and a soap bubble have the same radii Surface tension of soap solution is half of that of water The ratio of excess pressure inside the drop and bubble is A 1 2 B 2 1 C 1 4 D 1 1

r The electric potential between a proton and an electron is given by V V en where ro is a constant Assuming Bohr s model to be applicable the magnetic dipole moment of the electron proportional to n n is principle quantum number x is equal to

In a reversible thermodynamic process undergone by a fixed amount 2 moles of diatomic gas molar heat capacity remained constant When the temperature of the gas changes from To to 2T as shown in the graph Take R to be universal gas constant Initial pressure of gas Po 1 Work done by the gas during process AB is A RTO B 3 RTO C 5 RTO ct 3R To D 6 RT

Two blocks of mass m and 2m are connected to a spring and wrapped around a smooth pulley as shown in the figure Blocks are released together with spring in natural length Calculate the maximum elongation in meters of the spring Given 3 meter mg K m K 201

A B and C are voltmeters of resistances R 1 5 R and 3 R respectively When some po tential difference is applied between X and Y the voltmeter readings are VA VB and Vc respectively B A A VA VB VC B VA VB VC C VA VB VC D VB VA VC

23 A Ferris wheel is elevated 1 m above the ground When a car reaches he highest point on the Ferris wheel its altitude from ground level is 31 m How far away from the center horizontally is the car when it is at an altitude 24 m

The pV diagram shown is for 7 50 moles of an ideal diatomic gas taken through a cycle from A to B to C The ideal gas constant is R 8 314 J mol K How much heat is exchanged with the gas during the BC part of the cycle p Pax 10 D 5 00 3 00 Select one a 30 kJ b 4 kJ c 4 kJ a 0 200 1 T b 0 600 V m

4 A person walks the following distances in the sequence given 1 500 meters north of west 2 1200 meters 0 east of north 3 1000 meters in east direction 4 500 meters south of east 5 1200 meters 0 west of south What is his net displacement

21 Apparent observer frequency frequency of train A is heard by in train B as 3 4 of the true Find the value of velocity of train B in m sec taking train A to be stationary If the sound velocity is 332 m sec A 110 C 75 B 108 D 83

In the circuit shown in the figure the effective resistance between A and B is 1 20 2 40 3 6 4 80 1 652 852 42 8 52 2 652 www 402 B 3 4

7 A ball is thrown vertically downwards with velocity 2gh from a height h After colliding with the ground it just reaches the starting point Coefficient of restitution is B 1 2 A 1 2 C 1 D 2

N moles of a monatomic gas is carried round the reversible rectangular cycle ABCDA as shown in the diagram The temperature at A is T The thermodynamic 1 15 3 20 2P p P A B To D V 2V efficiency of the cycle is 2 50 74

A body sliding down in a inclined plane have coefficient of friction 0 5 If the normal reaction is twice that of resultant downward force along incline The angle between the inclined plane and the horizontal is 1 45 3 30 2 60 4 37

Find flux through a circular disc of radius R kept in a region of magnetic field perpendicular to the disc The magnitude of field at a distance r from centre of the disc is given by B ar where a is a constant 2 R 4 TOR 3 O aR 3

A hinged construction consists of three rhombi with equal sides The vertex A3 mo with velocity V to the right Then A Speed of A is V 3 C Speed of A2 is V 3 B Speed of A is 2V 3 D Speed of A is 2V 3

For a gas sample with No number of molecules function N V is given by N V 3 V for dN dV V 0 V V and N V 0 for V Vo Where dN is number of molecules in speed range V to V dV The rms speed of the molecules is A B Vo Correct Answer Your Answer Vo DU

25 180 In circular motion The centripetal acceleration is Due to change in magnitude of velocity only Due to change in direction of velocity only Due to change in both magnitude and direction of velocity Neither due to change in magnitude of velocity nor due to change indirecti

45 180 On an open ground a motorist follows a track that turn to his left by an angle of 72 after every 1000 m Starting from a given turn the displacement of motorist at forth turn is 1500 m 1000 m 1732 m 4000 m

Determine the Thevenin equivalent circuit shown in the figure as seen by the R 9 22 resistor Then calculate the current flowin through the R 9 Q resistor 4 A www 10 92 www 10 92 www R The current flowing through the R 9 Q resistor is A