Basic Physics Questions and Answers

9 a is If a charged particle of specific charge m entering in a uniform magnetic field of strength B which is extended upto a distance 4d as shown in figure at a speed v 2 a d B then which of the following is correct 4d 2 0 XXXXXXX XX x XX XX XX 1 angle subtended by path of the charged particle at the centre of circular path is 6 till it exits out of the field 2 the charge will move on a circular path and will come out from magnetic field at a distance 4d from the point of insertion 3 the time for which particle will be in the 2 magnetic field is aB 4 the charged particle will subtend an angle of 90 at the centre of circular path till it exits out of the field

3 Graphical representation of pressure variation in both end open organ pipe B Graphical representation of pressure variation in one end closed orgon pipe B Snapshot of string fixed at both ends B Snap shot of a string fixed at one end and connected to a smooth massless ring that is constrained to move vertically A B Extreme position P Maximum kinetic energy at B Q Maximum potential energy at B R Maximum particle velocity at B S Maximum particle acceleration at B

36 If a magnet is suspended at an angle 30 to the magnetic meridian the dip needle makes an angle of 60 with the horizontal The true value of dip is 1 tan 2 3 3 tan 3 2 tan 3 2 4 tan 2

55 A beam of protons with a velocity of 4x105 m s 56 enters a uniform magnetic field of 0 3T The velocityeet makes an angle of 60 with the magnetic field pitch of the helical path taken by the proton beam is 1 44 cm 2 4 4 cm 4 8 8 cm 3 88 cm A negatively charged particle mass Telegram feet charne

12 A spherical ball is compressed by 0 01 when a pressure of 100 atmosphere is applied on it Its bulk modulus of elasticity in dyne cm2 will be approximately AP AV 1 10 2 2 10 3 105

A giant Ferris wheel having a radius R 16 0 meters rotates in a 50 0 kg red box is located on the bench seat inside the cage The box does not slide on the seat as the Ferris wheel rotates The cage and the box both remain upright a all times as the Ferris wheel rotates 0 102 N 0 154 N Red box on seat O 0 204 N R 17 If the box does not slide on the seat at any point what is the minimum coefficient of friction needed so that the box does not slide Giant Rotating Ferris Wheel Cage

In a room of a building there are some equipments installed such as 1 two fans of 50 watts each 2 three tube lights each of 100 watts What will be the total load in watts of the room B 400 450 350 D 300

15 2 kg of water is heated from 0 C to 4 C The specific h capacity of water is 4200 J kg K and its densities are 99 kg m and 1000 kg m respectively at these temperatur The atmospheric pressure is 10 pascal What is the cha in internal energy a 33 6 kJ 1936 10 b 33 6 2 10 kJ L

d circuit is in resonance A conducting structure AOB is made to move with velocity as shown in figure V The potential difference between A and B is XX A X X X X X X X O X X Ao L X x O X X X X B X X a JBLY b BLY BLUsing c BLY Blysing 1 X Magnetic field B OB L

b An acceptable field drift of a magnet is approximately 10 Hz h Calculate how much the flux density of a 600 MHz instrument will change over 20 years a typical lifetime of an instrument What is the change in 1H Larmor frequency over the same time period

5 If net force acting on any object is zero then a The object can t have any rotational motion b The object can have a rotational motion c The object can t have an accelerated translation motion d The object can have an accelerated translation motion B C O abcd

10 The following table gives the variation of periodic current over the period T t sec 0 T 6 T 3 T 2 2T 3 5T 6 T A amp 1 98 1 30 1 05 1 30 0 88 0 25 1 98

Consider a car moving along a straight horizontal road with a speed of 72 km h If the coefficient of kinetic friction between the tyres and the road is 0 5 the shortest distance in which the car can be stopped is g 10 m s 1 30 m 2 40 m 3 72 m 4 20 m

37 1 2 View In English White light is incident on a soap film of refractive index 4 3 at an angle of refraction 30 The reflected light is observed to have a dark band for wavelength 6x105 cm Calculate the minimum thickness of the film 3 4 ct Answer 1 unattempted 2 59x10 5 cm 2 59x102 cm Complete Question Content 2 59 10 7 cm 2 59 10 10 cm Close

51 The scale of a galvanometer is divided into 150 equal divisions The galvanometer has the current sensitivity of 10 divisions per mA and voltage sensitivity of 2 division per mV Find the resistance of the galvanometer 1 50 3 50000 educ 2 500 4 5000

A point source of power 4 W is placed 1 m below the free surface of liquid whose refractive index Find the rate of transfer of energy in watt from the liquid surface to air 3 Ignore any absorption or scattering of light energy

1 10 2 3 10 4 50 A rod has a total charge Q uniformly distributed along its length L If the rod rotates with angular velocity about its end compute its magnetic moment 1 2 10 3 4 10 7 QooL 6 2 QoL 3

A student is designing a circuit in which he takes 80V voltage source which supplies a current of 20 Amperes to two resistors with equal resistances The value of each resistance for a series combination is 8 ohms True False

3 In the given circuit AB is a uniform wire of 10 ohm and length 1 m It is connected in series with a cell E of emf 2 V and negligible internal resistance and a resistance R Terminal A is also connected to a cell E of emf 100 mV and a galvanometer G In this set up a balance point is obtained at 40 cm mark from A Calculate the resistance R If E were to have an emf of 300 mV where will you expect the balancing point to be E A E R R 102 G B

Q No 10 Figure shows a planet in an elliptical orbit around the sun S Where is the kinetic energy of the planet maximum P Correct Answer 4 P P2 P3 PA P S k D P P 2 Vie

4 ar If two straight current carrying wires are kept perpendicular to each other almost touching then the wires 1 Attract each other 2 Repel each other 3 Remain stationary

38 A uniformly charged ring of thickness surface charge density a is rotated about with angular velocity o The magnetic field at the centre is legrand its axis too 1 oto 2 0 Hooto 2 LAY Mane

ASCENT N3 N4 N5 N7 N8 N9 21 The coefficient of static and kinetic friction between the two blocks and also between the lower block and the ground 0 6 and 0 4 Find the value of tension T applied on the lower block at which the upper block begins to slip relative to lower block are M 2kg 1 0 6 14 0 4 M 2kg T

12 A particle is moving on a circular path of radius 10 m with uniform speed of 4 ms 1 The magnitude of change in velocity of particle when it completes a semi circular path is 1 4 ms 1 2 8 ms 1 3 10 ms 1 Zom

A block of mass m is pulled by a constant power P placed on a rough horizontal plane The friction co efficient between the block and surface varies with its speed v as The acceleration of the block when its speed is 3 m s will be 1 1 v P 3m 0 2 P 3 m 21 1 20 P 3m

An ice cube is floating in a liquid of relative density 1 2 contained in a beaker When ice melts the level of liquid in the beaker X Falls Rises Remains unchanged

Two friends Ram and Shyam walk at constant speeds on the way to their school Shyam started little latter than Ram passes a certain mango tree 20 min latter than Ram and in further 10 min reaches the school If both of them reach the school at the same time what is the ratio of speed of Shyam to that of Ram A 1 2 B 2 1 C 2 3 D 3 2

4 The sun s angular diameter is measured to be 1920 The distance of the sun from the earth is 1 496 x 10 m What is the diameter of the sun a 1 39 x 10 m c 1 39 x 10 m b 1 39 x 10 0 m d 1 39 x 10 2 m

Why ans is not eddy current losses Q24 In transformer core is made of soft iron to reduce a Hysteresis losses b Eddy current losses c Force opposing electric current ell

There will be an increase in the potential energy of system if work is done upon the system by 1 Any conservative or non conservative force 2 A non conservative force 3 A conservative force 4 None of the above

1 A small ball is left in a viscous liquid in a tall container from large height Correct graph of its speed with time is Assume clock starts when ball hits the liquid surface 1 A 3 C Speed time 2 B 4 D B A

2 Find out the correct sequence of the pathway in which the food passes to get digested a Mouth Stomach Oesophagus Small intestine b Mouth Oesophagus Stomach Small intestine c Mouth Stomach Small intestine Oesophagus d Mouth Oesophagus Small intestine Stomach 3 Moon B O Earth Sun Make the Point D in the figure Bold It is necessary to follow all the precautions related to Covid 19 H

at will happen in the place marked D on earth in the diagram given above a Total solar eclipse b Partial solar eclipse Partial lunar eclipse d Solar eclipse will not be seen Choose the correct sequence regarding introduction of different types of transports a Palanquin Two wheeled rickshaw Bullock cart Cycle b Bullock cart Palanquin Cycle Two wheeled rickshaw c Palanquin Bullock cart Two wheeled rickshaw Cycle d Bullock cart Palanquin Two wheeled rickshaw Cycle Vehicle Symbol Cycle 00 88 88 88 88 Big bridge

lustration 16 aree strings Find the tension in all the three strings OLUTION Let A block of weight 100 N is suspended as shown with the help of To tension in the string connected to block T tension in the string OA tension in string OB T 60 0 W 60 100 N

The equivalent resistance between the points A and B is A B O O O 5R 9 2R 3 R R www R R www R funny

A graph showing the change in potential energy as two protons approach is shown A PE Which of the following statements is true The protons are attracted to each other through the gravitational force When the protons get very close the strong nuclear force causes the protons to attract The increase in potential energy as the protons approach is caused by the strong nuclear force When the protons get very close the potential energy decreases because the

A magnetic flux through a stationary loop with a resistance R varies during the time interval t as at t t Find the amount of heat generated in the loop during that time The inductance of the loop is to be neglected al ring of square

7 It is desired to punch a hole of 20 mm diameter in a plate 20mm thick If the shear stress fo mild steel is 30 kg mm the force necessary for punching would be approximately in the range b 15 20 t d 35 40 t a 10 15 t c 20 25 t

A person walks 80 m east then tums right through angle 143 walks further 50 m and stops His position relative to the starting point is 1 50 m 53 east of south 2 50 m 53 south of east 3 30 m 37 south of east 4 30 m 53 south of east

27 Let a and be the roots of the quadratic equation x sin 0 x sin 0 cose 1 cose 1 0 0 45 and a B Then B 1 3 1 1 cose 1 1 cose 1 1 sine 1 1 sin0 n 0 is equal to 2 4 1 1 cos 0 1 1 cose 1 sine 1 sin0

Three forces F F and F3 are acting on a particle of mass m such that F F2 F3 0 If the force F is now removed then the acceleration of the particle in O F2 F3 m OF m F

Cycle Bus Cycle rickshaw Cycle van Bullock cart 9B Lorry Motor Car Symbol Auto rickshaw Ferry boat Motorcycle Scooter P6 88 88 88 80 818 06 88 88 09 00 06 to op 88 88 88 9 88 School a Cycle b Bus c Motor car d Lorry 6 Look at the graphs given below W GAN 8 N S E Big bridge Thin bridge Canal The map of transport system of a locality is given below Observe the map Which vehicle can travel on all roads

10 Two equal forces are acting on a particle The magnitude of the resultant force is 2 times the magnitude of the either force At what angle they are inclined to each other A 0 B 90 C 1809 D 45

A magnetic field B 2t 1 2t T where tis in second is applied perpendicular to plane of a circular wire of radius and resistance R What electric charge will flow through circular wire during interval t 0 s to t 2 s O 2 48 r R O 20 r R

A beam of light of wavelength 6000 falls on a narrow slit and the diffraction pattern is observed at a screen 3 m away from the slit If the slit width is 0 9 mm then the position of the first order minimum from the centra maximum is O 4 mm 3 mm 0 1 mm O2 mm

The coil of a calorimeter C has a resistance of R 6002 The resistance R 309 The coil R is connected to the circuit as shown in figure The reading of ammeter is 3A and 240 gram water is present in container What will be the change in temperature of water in C after 7 minutes Disregard the resistances of the battery and the ammeter and the heat losses and heat capacity of the calorimeter and the resistor Specific heat of water is 4200JKg K R 2005 W R MAPA 7 A C

mass m are Two identical blo placed on a smooth horizontal plane At t 0 Block B is given a velocity of 5 m s Calculate the compression in the spring when velocity of A is 3 m s given spring constant of ideal spring is k 5m s 1 2 3 4 8m V k 10m V k 4m k 12m B 20000000 A

A uniform rod AB of length form an angle 30 with the vertical as it strikes the frictionless horizontal surface with vertical velocity v and no angular velocity as shown Assuming the impact is perfectly inelastic derive expression for the angular velocity of the rod immediately after the impact 1 6 v 5 L 9 v 30 A 2 12 V 7 L V T

Which of the following functions describes the nature of interaction potential V r between two quarks inside a nucleon r is the distance between the quarks and a and b positive constants of suitable dimensions a V r br 1 a b V r br a a c V r br d V r br Y r

The ratio of respective capacitive reactance when connected with a source of frequency 40 Hz and 60 Hz is 2 3 3 2 1 3