Basic Physics Questions and Answers

withate it c remember it Select the most suitable alternative in accordance with the correct grammatical rules d understand it V a The villagers were enjoying winter evening around the fire b The villagers were enjoying winter evening around a fire c The villagers were enjoying winter evening around fire d The villagers were enjoying winter evening round fire

Two blocks of mass 5 kg and 3 kg are placed on a smooth floor as shown in figure There is no friction between the blocks A horizontal force 15 N is applied P Q R S 5kg 3kg List I Acceleration of 3 kg block in SI unit if force is applied on 5 kg block Acceleration of 3 kg block in S1 unit if force is applied on 31 block kg If force is applied on 3 kg block at an angle of 30 with horizontal then force of interaction in S1 unit between the two blocks is If force is applied on 5 kg block at an angle of 30 with horizontal then force of interaction in SI unit between the two blocks is List II 1 50 2 0 3 42 5 4 5

F2 point is a i j k Wb m c i j k Wb m b j k Wb m d i j k Wb m 18 A large metal sheet carries an electric current along its surface Current per unit length is 2 TOO b O ON Magnetic field induction near the metal sheet is po Ho 2 2 a o c po 2 d 22 The magnetic 19 A square frame of side 1m carries a current produces a magnetic field B at its centre The same current is passed circular coil having the same perimeter as the nt the centre of the circular

Consider a long conducting rail separation between track is l fixed in uniform magnetic field B directed normal to the plane of rail tracks and shunted by an uncharged capacitor of capacitance C A conducting rod of mass m given velocity V and then kept gently and symmetrically on tracks as shown Neglect any resistance i e of track and conducting rod and any friction between rod and track Use B2 C 2m Answer the following 2 questions based on the given arrangement Final velocity of rod is A Vo B O V xg x C X Vox X

c remember it d understand it Select the most suitable alternative in accordance with the correct grammatical rules a The villagers were enjoying winter evening around the fire b The villagers were enjoying winter evening around a fire c The villagers were enjoying winter evening around fire d The villagers were enjoying winter evening round fire

How does temperature affect the Spee d of Sound its frequency and its wavele ngth respectively I was doing one question where I saw t hat we had kept the wavelength consta nt as the temperature changes but as f ar as I remember the frequency of soun d only depends on the nature of the sou rce

A parallel plate capacitor is made by stacking n 4 equally spaced plates connected alternately If the capacitance between any two plates is C then the resulting capacitance is 1 C 2 nC 3 n 1 C 4 n 1 C 24H n and 1 C 2 nC 3 n 1 C 4 n 1 C affe kunt kan aft

A given charge situated at a certain distance from an electric dipole of very small length along its axial line experiences a force F If the distance of charge is doubled the force on the charge will become

A rod of length 5 cm is placed longitudinally on the optical axis of concave mirror of focal length f 20 cm such that image of one end coincides with itself and the image is diminished The axial magnification produced by mirror is 1 3 2 3 415 3 2 4 4 3 5

ALLEN In figure V is the potential barrier across a p a34 junction when no battery is connected across the junction 1 1 to 3 both correspond to forward bias of junction 2 3 corresponds to forward bias of junction and I corresponds to reverse bias of junction 3 1 corresponds of forward bias and 3 corresponds to reverse bias of junction 4 3 and I both correspond to reverse bias of geg 1 13 t 3 1l

C Bulb B goes out and bulb A dims D Bulb B goes out and bulb A gets brighter An L C circuit has capacitance C C and inductance L L A second circuit has C C 2 and L 2L and third circuit has C3 2C and La L 2 All the three capacitors are charged to the same potential V and then made to oscillate Then A Angular frequency of oscillation is same for all the three circuits B Maximum current is greatest in first circuit C Maximum current is greatest in second circuit D Maximum current is greatest in third circuit DOD

65 A piece of marble is projected from earth s surface with velocity of 19 6 2 ms at 45 2 s later its velocity makes an angle a with horizontal where a is b 30 c 60 a 45 d 0 W2 14 2 2 ifi An object of mass m is projected with a momentum p 1 4th of its

line horizontally 82 A cart is moving a constant speed of 30 ms A projectile is to be fire from the moving cart in such a way that it will to the cart at the same point on cart after the moved 80 m At what velocity relative to the be projectile be fired Take g 10 ms a 10 ms e 40 3 ms 1 b d 20 3 80 3 ms 1 ms retur cart h cart

3 tan 5 5 Twelve resistance each of resistance R are 45 connected in the circuit as shown in Fig Net resistance between points A and B would be 1 SR 7R 3 R 3R 4 tan Enthusiast Leader Achiever ALL PHASE 3 tan are fadas foden faangen anford i farg a Bum sifat SR 1 3 7R 2 e 3 R 4 tan A F B 1001CMD30311910

3 A resistor an ideal capacitor and an ideal inductor are connected in parallel to a source of alternating 250 voltage of 800V at a frequency of Hz A current of 3A flows through resistor a current of 1A flows through the inductor and the total current through the circuit is 5A If II then the capacity of the capacitor is 1 12 5 F 3 9 2 F 2 10 F 4 8 2 F

179 A ball is thrown from the ground to a wall 3 m high a distance of 6 m and falls 18 m away from the wall the angle of projection of ball is 2 3 a tan 1 3 2 tan 2 c tan d tan 4 The horizontal range and maximum height attained b

A block of mass 2 kg is released from rest on a smooth inclined plane of inclination 30 and connected by a massless spring of force constam 1000 N m as shown in figure Initially the spring is in its natural length An external variable force also acts on the block down the inclined plane Block comes to rest for a moment after travelling a distance of 20 cm along the inclined plane From initial to this moment list I gives work done by various forces and list II gives their values Pomomomo 20cm A 2kg 30 List I P Work done by gravity Q Work done by spring R Work done by external force S Work done by normal force P 2 Q 1 R 3 S 4 List II 1 zero 2 18 J 3 20 J 4 2 J

SMCQ 1 0 25 Q 40 An inductance L is split into three equal parts AB BC and CD and a capacitor C is connected across its two centre terminals figure The outer terminals are short circuited The frequency of oscillation is AK lllllll Answer VEX VIC 3 x B L reeeeeee C lllllll Rate this question

4 50 Hz 50 m s 4 m s The phase difference between the displacement 44 and acceleration of particle executing SHM in radian is 1 7 4 2 10 gm of ice at 5 C is added to 10 gm of water 45 4 50 Hz 50 m s 4x m s ellt Z face a 1 7 3 5 C 10 gm 60 C 10 gm 4 2

45 An alternating voltage at different frequencies is applied across a capacitance C Which of the following graphs correctly depicts the variation of current with frequency 3 K A C generator 2 4 INUO IA K w

An electron is moving along the positive X axis You want to apply a magnetic field for a short time so that the electron may reverse its direction and move parallel to the negative X axis This can be done by applying the magnetic field along a Y axis c Y axis only b Z axis d Z axis only

33 A particle is projected from the ground at an angle off with the horizontal with an initial speed of u Time after which velocity vector of the projectile is perpendicular to the initial velocity a u g sin 0 c 2u g sin 0 b u g cos 0 d 2u tan 0 kak kaken by

A particle moves in xy plane such that its position as a function of time is given by x 2 sin 2nt y 2 1 os 2nt Where all parameters are in S I units Then choose the INCORRECT statements out of the following B D Path of the particle is symmetrical about x axis Net force on the particle is always directed towards origin Speed of the particle is changing with time Average speed of the particle in the time interval t 0s to t 2s is 4 m s

A B is T a 1 5 c 1 40 d 40 1 76 A particle is projected from horizontal making an angle of 53 with initial velocity 100 ms The time taken by the particle to make angle 45 from horizontal is 46 14 s b 2 s c Both a and b 5x d None of these T noint A at t is 3

Two balls are projected simultaneously with same speed from top of a tower one vertically upward and the other downward They reach the ground in 9 s and 4 s respectively Height of the tower is g 10 ms 2 1 100 m 2 120 m 3 180 m

A drilling machine of power P watts is used to drill a hole in copper block of mass M kg If the specific heat of copper is s Jkg 1 C 1 and 40 of the power is lost due to heating of the machine the rise in the temperature of the block in T seconds will be in C Question Type Single Correct Type 1 2 0 4PT Ms 0 6PT Ms

1 10 m s 2 10 m s 3 10 m s 4 0 1 m s A compound microscope has an objective of 18 focal length 2 0 cm and an eye piece of focal length 6 25 cm and distance between the objective and eye piece is 15 cm If the final image is formed at the least distance of distinct vision 25 cm the distance of the object from the objective is 1 1 5 cm 3 3 0 cm 2 2 5 cm 4 4 0 cm 1 10 m s 3 10 m s van de gewen herfra 2 0 cm 6 25 cm gach a 15 cm fe fa fafara 42 25 cm a grea ang 2 10 m s 4 0 1 m s 1 1 5 cm 3 3 0 cm 2 2 5 cm 4 4 0 cm

Find the potential difference across the capacitor 6 in volts 1 4 V 2 2 V 3 IV 4 8 V R www R www R 10V R www C R 1 4 V 2 2 V 3 IV 4 8V fama alan y C R wwwww R www wwww R ww 10V wwwww R

A small electric dipole is kept at origin so that its dipole moment is along positive x axis If the magnitude of electric field due to is same at points a 0 and 0 b then the ratio of a and b is 1 1 22 3 W N 2 23 2 23 1 24 4

Topic SYLLABUS 4 5 6 A single slit Fraunhofer diffraction pattern is 1 formed with white light For what wavelength of light the third secondary maximum in the diffraction pattern coincides with the second secondary maximum in the pattern for red light of wavelength 6500A 1 4400 A 3 4642 8 A 1 2 4100 A 4 9100 A fe fada af single slit fazu auf diffraction pattern fa fa fa fa fa third secondary maxima 6500A fadia fede afe 1 4400 A 3 4642 8 A 2 4100 A 4 9100 A

A current of 1 6 A is flowing through a wire 17 having cross sectional area 1 mm If density of free electrons in the material of the wire is 10 per m the drift velocity of electrons will be 1 10 m s 3 10 m s 2 10 m s 4 0 1 m s 1 6 A mm sre varfe gratiam vad ym ria 10 de an 1 10 m s 3 10 m s 2 10 m s 4 0 1 m s

If the maximum of the energy per unit volume u v shifts to higher frequencies with increasing temperature show that the maximum of u be found by solving the equation 8 hv 1 c e hv 1 3x e 3

List I Name List II Type A Oldham coupling 1 Joins collinear shafts and is of rigid type B Flange coupling 2 Joins non collinear shafts and is adjustable C Universal coupling 3 Joins collinear shafts and engages and disengages them during motion

P1 i A Si sample is doped with 10 6 cm boron atoms and a certain number of donors The Fermi level is 0 36eV above E at 300K 15 points a Draw the energy bands for the sample 5 points b What is the donor concentration for the sample 10 points

23 An electron initially at rest is accelerated through a potential difference of 20 volt so that it acquires a velocity 8 4 x106 m s The value of e m of electron will a 1 76 x10 1 C kg b 2 76 x10 2 C kg c 0 76x10 2 C kg d None of these

A monkey is climbing up a rope then the tension in the rope a must be equal to the force applied by the monkey on the rope b must be less than the force applied by the monkey on the rope c must be greater than the force applied by the monkey on the rope d may be equal to less than or greater the force applied by the monkey on the rope

3 ML T 4 M L T 3 The equation for the displacement of a stretched 43 4 string is given by y 4 sin 2x 0 02 100 Where y and x are in cm and t in sec The i frequency ii velocity of the wave iii maximum particle velocity are 1 50 Hz 50 m s 20x m s 2 50 Hz 20 m s 50 m s 3 50 Hz 50 m s 2 m s 4 50 Hz 50 m s 4x m s The phase difference between the displacement 44 3 ML 4 M LT ya af g fazeny 4 in 2x X 100 0 02 ya x cm 1 i i 1 1 50 Hz 50 m s 20 m s 2 50 Hz 20 m s 50 m s 3 50 Hz 50 m s 2x m s 4 50 Hz 50 m s 4x m s

A lead sphere of mass m falls in viscous liquid 41 with terminal velocity v Another lead sphere of mass M falls through the same viscous liquid M with terminal velocity 4v the ratio m 1 2 2 4 3 8 TI is 4 16 Fra EN BATA PUTA ZA 4 ficar at M m 1 2 v 2 4 4 16

Inclined surface of a smooth wedge of mass M 6 kg makes an angle of 60 with horizontal as shown A ball hits the wedge horizontally and elastically with a velocity of 40 m s and moves vertically with respect to ground after the collision If the mass of the ball is m find M m the wedge can also move on the smooth floor 60 40m s

viii Probability of an event is a b C d Number of cases in which event occur Total Number of Cases Total Number of cases Number of cases in which event occur Both a and b None of these FIFT

A body is sliding down an inclined plane angle 39 of inclination 45 If the coefficient of friction is 0 5 and g 9 8 m s then the acceleration of the body downwards in m s is 4 9 2 3 19 6 2 1 2 4 9 2 4 4 9 1 de fra et af 0 5 9 8 m s and m s 4 9 3 19 6 2 2 4 9 2 4 4 9

Two swings in an amusement park have length 12 time periods T and T2 respectively They both are drawn a side together and released at the same instant to swing in small oscillations After what time interval will they again be in phase with each other

What is the approximate mass of air in a living room 5 8 m x 3 5 mx 3 0 m The density of air is 1 29 kg m Express your answer to two significant figures and include the appropriate units

37 the percentage errors in the measurement of 37 length and time period of a simple pendulum are 1 and 2 respectively then the maximum error in the measurement of acceleration due to gravity is 1 8 2 3 3 4 4 5 1 8 2 3 1 2 1 at 3 4 4 5

b its lon A 50 cm long wire is moving in a uniform magnetic field of 0 8 N A m 1 1 with a velocity of 2 ms 1 perpendicular to both its length and the magnetic field Calculate the induced emf in the wire If the wire be moving parallel to the field what will be the value of the induced emf Ans 0 8 V zero 1070

A team of eight dogs pulls a sled with waxed wood runners on wet snow mush Each dog exerts an average force of 173 N backward on the snow and the coefficient of kinetic friction is k 0 100 between the waxed wood and wet snow The dogs have average masses of 27 3 kg and the loaded sled with its rider has a mass of 187 kg Calculate the magnitude of the tension force in the rope between one dog and the sled Use 9 80 m s2 for the acceleration due to gravity

A conducting disc of conductivity o has a radius a and thickness t If the magnetic field B is applied in a direction perpendicular to the plane of the disc changes with time at the rate of a The dB dt power dissipated in the disc due to the t a induced current is x x is a then the value of Jac uca a that had duda en a B Raz ka wa chr dB dt

The DRDO recently conducted successful test firing of a new version of Shaurya nuclear capable ballistic missile It is a category of missile A air to air B surface to air C air to surface D surface to surface

A point P lies on the axis of a ring of mass M and radius a at a distance a from its centre C A small particle starts from P and reaches C under gravitational attraction only Its speed at C will be A B 2GM a 2GM a 2GM a C D zero 1 1 2 1

capacitors An infinite grid is made of identical of capacitance Co each as shown in figure The equivalent capacitance between points A and B is given by Find the value of n ych 37 A3 A tef uz C gg59 Fuk Afa 13 21 f nCo 3 en du kan Magi TI IIII HA H B III nCo 3 A