Basic Physics Questions and Answers

2 23 Figure shows the graph of the x co ordinate of a particle going along the x axis as function of time Then the instantaneous speed of particle at t 12 5 s is m s 8 m 4 m 4 s 8 s 12 s 16 s B

Skipped Spring Moss System block of mass mhangs by means of a string which goes over a pullay of mass m and moment inertia I as shown in the diagram The string coas not sip relative to the puley Find the aquency of small oscillations M Osallations Simple Harmonic Motion 25 28 2 28

IR PHYSICS MOTION IN A STRAIGHT LINE 132 A train takes t sec to perform a journey if n 3 travel for t sec with uniform speed v n and finally it comes to rest with uniform retard ation Then average speed of train is 1 3n 2 V 2 2n 3

A Ball of mass m strikes the inclined face of the wedge perpendicularly with speed vo The wedge is at rest on a rough horizontal surface before collision The conservation of momentum is applicable for i m as system along y ii M as system along y iii M m as system along x iv M m as system along y which of the following is correct A i only C iii only B i ii only D iii iv only 90 M a AY X X

A capillary tube of length 8 cm is immersed 2 cm inside the water vertically then water rises up to 4 cm in the capillary If the same tube is immersed 5 cm inside the water then water will rise in capillary up to a height of x 4 cm 3 cm 5 cm 8 cm

2 The magnetic moment of a small bar magnet is 0 9 A m If it is placed in a uniform magnetic field making an angle of 30 with it a torque of 0 063 Nm acts on it What is the magnetic field 0 14 T

Radius of the first circular orbit of hydrogen atom is 0 53 10 0 m Speed of the revolving electron charge 1 6 10 C in this orbit is 2 186 106 m s Deter mine the magnetic moment of the electron 9 27 x 10 24 A m

Q1 87 4 3 2 From NCERT Two particles P and Q start from origin and execute Simple Harmonic Motion along X axis with same amplitude but with periods 3 seconds and 6 seconds respectively The ratio of the velocities of P and Q when they meet is 1 1 2 2 2 1 3 2 3

A 6 ms B 1 ms A 160 N 0 6 and A system of two blocks is shown in figure Friction coefficient between 5 kg and 10 kg block is between 10 kg and ground is 0 4 What will be the maximum value of force F applied at the lower block so that 5 kg block does not slip w r t 10 kg g 10 m sec The force applied at the upper block is having fixed magnitude of 80 N both forces start to act simultaneously C 2 5 ms B 250 N H 0 6 5kg H2 0 4 10kg 80 N F C 210 N D 310 N

Two blocks of masses M and M are connected to each other through a light spring as shown in the figure If we push the mass M with a force F and cause acceleration as in the mass M what will be the acceleration of M M 3 a FM M 2 F M M F M a M

The ratio of contributions made by the electric field and magnetic field components to the intensity of an electromagnetic wave is c speed of electromagnetic waves 1 c news 1 0 c 1 1 1 1 2 3

A body of mass 2 kg has an initial velocity of 3 m s along horizontal direction and it is subjected to a force of 4 N in vertical direction The distance of the body from O after 4 seconds will be A 12 m B 20 m 8 m C F ma 2 kg 3 m s

3 A string of mass 0 8 kg m is stretched to a tension 500N Mean power required to maintain a traveling wave of amplitude of 10mm and wavelength 0 5m is X watt Find integer next to X 99

An aeroplane is flying horizontally at a height of 980 m with velocity 100 ms drops a food packet A person on the groundi 414 m ahead horizontally from the dropping point The velocity with which he has to move to catch the food packet is in m s

An electric bulb is designed to operate with a power of 500 W at 100 V line It is connected in series with a resistor of resistance R This combination is connected to 200 V supply as shown The value of R so that the bulb delivers 500 W is 12 6 20 20 R R www 200V p y 2 Ran 40 500 20012 20 R

Use synthetic division to find the function values Then check your work using a graphing calculator f x 3x5 4x 2x x 9 find f 18 and f 3 18 1 3 Simplify your answer Simplify your answer

Which statement is corrrect for a zone plate and a lens 1 Zone plate has multi focii whereas lens has one 2 Zone plate has one focus whereas lens has multiple focii 3 Both are correct 4 Zone plate has one focus whereas a lens has infinite

In the given figure the potential difference V has been plotted against current I for a metallic conductor at two different temperatures 25 C and 100 C respectively The temperature co efficient of resistivity of the wire is R 4R Rat T 100 C Vor 30 1 16x10 2 C 2 4x10 1 C 60 XXX 7 T 25 C 33 x 2 53 75 2 8 102 C 4 2x10 C I

2 A small bar magnet is placed in the magnetic meridian with its north pole pointing north If a neutral point is formed on its perpendicular bisector at a distance of 10 cm from its centre determine the moment of the magnet Given H 4 10 5 T 0 4 A m

Q1 A cylinder of radius a 0 1 m is placed as shown below in a uniform electric field of E 50iN C The total electric flux through the cylinder is a 1 57Nm C b 3 14Nm C c 0Nm C d 5 0Nm C guilateral

In the situation shown in the figure blocks A and B each of mass m are placed on a large fixed and smooth inclined plane of inclination 0 30 The blocks are initially at rest and connected to spring of stiffness k at its natural length when a force F mg is applied on the block parallel to the plane What is the difference between maximum and minimum separation between the blocks in cm take mg k 9 8 cm VA Ve mmmmm e 30 m

6 An 1 m long straight solenoid has 1000 number of turns The relative permeability of its core material is 1000 If a current of 1 A passes through the solenoid what will be the magnetic intensity and the magnetic field along its axis 1000 A m 1 1 256 T P

3 In the given figure the potential difference V has been plotted against current I for a metallic conductor at two different temperatures 25 C and 100 C respectively The temperature co efficient of resistivity of the wire is Yumm V 1 16x102 3 4x10 2 C 30 T 100 C 60 T 25 C I 2 8 10 2 C 4 2x10 C

5 The temperature in degrees Fahrenheit F is related to the temperature in degrees Celsius C by the equation F C 32 a In the Sahara Desert temperatures often reach 50 degrees Celsius How many degrees Fahrenheit is this

A force F 20 N acts on a object and displaces it from rest to speed of 10 m s in its direction What is displacement if mass of object is 2 kg 1 6 m 3 12 m NCERT Pg 119 2 5 m 4 10 m

Refer the following arrangements consisting of two vectors of same magnitude Arrange them in ascending order of resultant magnitudes I A I II III IV C II IV III I II III B IV III II I D II I III IV IV

The electrical conductivity of a semiconductor increases when electromagnetic radiation of wavelength shorter than 2480 nm is incident on it The band gap in eV for the semiconductor is A 1 1 eV 0 0 5 eV B 2 5 eV D 0 7 eV 2005

Determine the magnitude and direction of the resultant of the thre Hisplacements Use separate sheet of paper for your solution 1818 18 1 d 150 m 40 N of W 100 m 600 N of E 175 m 30 S of E

13 A particle A is moving with velocity 31 4 m s and particle B is moving with velocity 37 41 m s The magnitude of velocity of Bw r t A is 1 6 m s 2 8 m s 3 10 m s 4 5 m s NCERT Pg 76 1 ve g 17

figure Choose the correct statement s C B A A B can be in the direction B A B C can be in the direction C A B can be in the direction D A B C can be in the direction

Q 15 Consider the normal incidence of a plane electromagnetic wave with electric field given by E exp i k z t over an interface at z 0 separating two media wave velocities v1 and v2 V2 vi and wave vectors ki and k respectively as shown in figure The magnetic field vector of the reflected wave is is the angular frequency Vi k m A Eo exp i k z ot V Eo V C Medium 1 exp i k z at 1 B D V2 Medium 2 k E exp i kz ox Eo exp i k z ax V W

An electric iron consumes energy at a rate of 840 W when heating is at the maximum rate and 360 W when the heating is at the minimum The voltage is 220 V What are the current and the resistance in each case

8 Electric field inside the cavity of uniformly charged sphere is 1 Non uniform 2 Uniform 3 Zero 4 Same as that on the surface of charged solid sphere

A ball is projected vertically upwards from ground with velocity v 24 m s Assume the air resistance produces a constant retardation of 2 m s Then g 10 m s 1 The maximum height attained is 28 8 m 2 Time of ascent is more than time of descent 3 Time of descent is more than time of ascent 4 Velocity of particle just before it hits the ground G m e

Two vectors A B add to give resultant R Angle between A B is 0 Angles of A B with are a respectively A If A B then a B B If A B then a B C If 0 90 B A B D If 0 0 then a 0 B 0

ALLEN 3 4 Which of the following is correct statements A dimensionally correct equation may be correct A B C D A dimensionally correct equation may be incorrect A dimensionally incorrect equation must be incorrect A dimensionally incorrect equation may be correct Which of the following three physical quantities can be taken as fundamental physical quantities A force mass and velocity B momentum time and mass C momentum mass and velocity D length velocity and time 3 4 fat A B C D fat Hilfe A B C D

A ball is thrown vertically upward with a velocity of 20 m s from the top of 160 m high building The time taken by ball to hit the ground is NCERT Pg 48 1 8 s 3 4 s 2 10 s 4 65

20 The position of an object moving along x axis is given by x 10 15t 52 where x is in meter and t is in second The velocity of body at t 3 s is NCERT Pg 45 1 15 m s 3 40 m s 2 30 m s 4 45 m s

4 60 kg m s 3 10 kg m s 3 Calculate the tension in the horizontal string B 1 mgtane 3 mgcote m 2 mgsine 4 mgcosece 6 4 M m A block of horizontal su 0 5 as s If the truc right with

Fig 2 2 shows two forces acting on an object 60 30 N 20 N Fig 2 2 not to scale Draw a scale diagram to determine the resultant force acting on the object State the scale you use scale

If percentage error in measurement of quantities A B C and D are 1 2 3 and 4 respectively then percentage error in measurement of z 1 5 2 4 3 6 A B 2 CV 3D 4 is NCERT Pg 27

1 Explain the basic properties of electric charges 2 Derive the expression for the force due to multiple charges 3 The charges of a system are 3 C 2 C 5 C and 4 C respectively What would be net charge of the system 4 Explain the electric field due to a system of charges

3 An electric dipole of length 20 cm having charges 3x 10 C placed at 30 degree with respect to a uniform electric field experience a torque of magnitude 6 Nm Calculate the i Magnitude of electric field ii Potential energy of the dipole

There is a non conducting disc of mass 4 kg and radius 1m placed on a rough non conducting surface A conducting ring of same mass is tightly fixed around the disc There exists a magnetic filed B 41 41 The resistance of the ring is 892 Find the time in sec after which the system will star toppling

3 A solid which is transparent to visible light and whose conductivity increases with temperature is formed by 2006 A Metallic binding C Covalent binding B lonic binding D Van der Waals binding

The angular frequency of a charged particle moving in a uniform magnetic field 1 Depends upon the mass and velocity of the particle ii Depends upon the mass and radius of the circular path of the particle iii Depends upon the charge and velocity of the particle iv Neither depends upon the velocity nor the radius of the circular path of the partic Identify the correct statement Options iv only 1 and iii

A ball A is falling vertically downwards with velocity v It strikes elastically 2 with a wedge moving horizontally with velocity v2 as shown in figure What must be the ratio 01 so that the ball bounces 02 back in vertically upwards direction relative to wedge 1 a 3 b c 2 01 30 d 1

A resistance of 50 N is connected in series with a capacitance of 20 F If a supply of 200 V 100 Hz is connected across the arrangemen find a the circuit impedance b the current flowing and c the phase angle between voltage and current Draw the phasor diagram

QUI A Man can row a boat in still water at 3km hr He can walk at a speed of 5km hr on the shore The water in the river flow at 2km hr If the man row across the river and walks along the shore to reach the opposite point On the river bank find the direction in which he should row the boat so That he could reach the opposite shore in the least possible time Also calculate this time the width of the river is 500m

point In this Module we have studied Kinematics or how different types of motion can be used to solve problems Consider the following problem and give your answers using the same letter sequence a b c etc A person holds a ball in their hand a Identify all the external forces acting on the ball and the Newton s third law reaction force to each one b If the ball is dropped what force is exerted on it while it is falling Identify the reaction force in this case Ignore air resistance c If the ball is thrown straight up in the air what force is exerted on it while it is rising Ignore air resistance Each question answered is worth K 4 T 6 C 8 A6