Physics Questions

The time period of a particle in simple harmonic mo ion is equal to the time between consecutive appearance of the particle at a particular point in its motion This point is 1 the mean position an extreme position 3 between the mean position and the positive extreme 4 between the mean position and the negative

5 A tank containing water of mass M is placed on a weighing machine A stone of weight w is hung and lowered in water without touching the sides If volume of stone is V and density of water is p what will be the reading of weighing machine in kgf now 1 M pV M 11 2 M ng ev M US mangford

91 A projectile is projected from ground with veloci 0 V at an angle 0 with horizontal What is th vertical component of velocity of projectile when vertical displacement is equal to half of th maximum height attained 0 1 3vo cose 2 sin 2 0 COSA duaibheque 01638 A 0 mont noto 26 ellos

18 A projectile thrown with initial velocity 20 m s at an angle 60 with horizontal then angle of velocity of projectile with horizontal after time 0 732 s is 1 45 2 30 3 0 4 15

A wire 50 cm long and 1 mm2 in cross section carries a current of 4 A when connected to a 2V battery The resistivity of the wire is 1 2 x 10 7 22 m 3 4 x 10 6 m VA 2 5 x 10 7 22 m 4 1 x 10 6 m

2 The electric resistance of a certain wire of iron is R If its length and radius both are doubled then the resistance 1 Will be doubled and the specific resistance will be halved 2 Will be halved and the specific resistance will remain unchanged 3 Will be halved and the specific resistance will be doubled 4 And the specific resistance both will remain unchanged PL Hint R and p is independent of geometry changes

A 120V line is protected by a 15A fuse What is the maximum number of 120V 500W light bulbs that can be operated at full brightness from this line A 0 B 1 C 2 D 3 coefficient of resistance for a conductor at 0 C is 0 0125 15 The tempe

An AC generator s coil has 2000 turns and is rotated with angular speed of 500 rad s If the area of the coil is 10 cm and the magnetic field is 0 2 T then the peak voltage in the coil will be 100 V 600 V 200 V 300 V

A bulb and a capacitor are connected in series to a source of alternating current If its frequency is increased while keeping the voltage of the source constant then O bulb will give more intense light O bulb will give light of same intensity as before O bulb will give less intense light O bulb will stop radiating light

A pipe 30 cm long is open at both the ends Which harmonic mode of pipe esonates at 1100 Hz source v 330 ms1 sound speed in air O First O Second O Third O Fourth

The maximum height attained by a projectile is increased by 10 keeping angle of projection constant What is percentage increase in time of flight 10 5 20 min sec 18

ving 76 Which of the foll 1 Two physical quantities having the same dimension can always be added 2 Precision always leads to accuracy 3 A dimensionally correct equation is always correct 4 If z A Bb then AA AB a b AZ Z may not be equal to

119 An ideal diatomic gas is slowly keeping pressure constant The work done by the gas is 1 Q Last 3 3Q 7 w 2 4 Q Q 7

The temperature coefficient of resistivity of a material is 0 0004 C 1 When the temperature of material is increased by 50 C its resistivity increases by 2 x 10 80 m The initial resistivity of the material in ohm metre is 4 x 0 1 1 50 x 10 8 3 100 x 10 8 Hint Ap Past 2 90 x 10 8 4 200 x 10 8

A small ball of mass 1 kg moves inside a smooth fixed cylinder of radius 1 m in vertical plane Axis of cylinder is horizontal The acceleration of the ball at point B is Given that velocity of ball at point A is 5 m s and g 10 m s mx 2 5 m s 3 15 m s O B ou mg 2 25 m s 4 5 5 m s S 0 NXES 25 20

In a Wheatstone bridge network the resistances are P 20 Q 20 R 20 and S 302 The resistance in 2 with which S is to be shunted so that the Bridge becomes balanced is A 4 B 6 C 8 D 10

RMS speed of a monatomic gas is increased to two times of its initial value If the process is done adiabatically then the ratio of final volume to initial volume will be 1 1 4 2 1 8 3 1 23 2 12 3

Question 13 and 14 are based on the following physical situation An ideal liquid of density p is filled in a horizontally fixed syringe fitted F with piston There is no friction between piston inner surface of the syringe Cross section area of the syringe is A An orifice is made at one end of the syringe When the piston is pushed into the syringe the liquid comes out of the orifice and then following a parabolic path falls on the ground With what velocity does the liquid come out of the orifice 2F pA F pghA PA a c VpA F 2pghA PA 6 d

An X ray photon of wavelength and frequency collides with an intially stationary electron but free to move 1 and bounces off If y and are respectively the wavelength and frequency of the scattered photon then O X X v v O X dir r V O X X r OX A r

Indicate the false statement You can select multiple options Modulation is the process of putting information onto a high frequency carrier The transmitter block in communications system contains the demodulator device The receiver block in any communications system contains the modulator device Modulation is the process of preserving all the properties of carrier signal

A block of mass 20 g connected to a harmonic motion with frequency of 04 Nm 05 Nm 1 O2 Nm 01 Nm 1 spring of spring constant K executes sim Hz Value of K is

A small mirror used by a dentist gives a magnification of 5 when it is held at a distance of 0 50 cm from a toot The radius of curvature and nature of the mirror used is O 1 25 cm convex 1 60 cm convex O 1 60 cm concave 1 25 cm concave

Two projectiles of same mass and same initial speed are thrown at 60 and 30 with vertical then which will remain constant Time of flight Horizontal range Maximum height reached min s Maximum height and range

2 A wire has resistance of 3 1 2 at 30 C and 4 5 Q at 100 C The temperature coefficient of resistance to the wire is approximately 1 12 x 10 4 C 1 2 24 x 10 4 C 1 3 32 x 10 C 1 4 7 x 10 3 C 1 Hint Use R R 1 R 1 a AT

The piston in a cylinder head of locomotive is having stroke length of 6 cm The piston is executing SHM with an angular frequency of 200 rad min 1 Its maximu speed is O 10 cms 1 15 cms 1 12 cms 1 16 cms 1

32 Which component is related to generation of nerve impulse resulting in sensation of hearing 1 Vibration of ear drum due to sound waves 2 Entry of vibrations in perilymph via circular window Generation of vibrations in reissner membrane

One end of a uniform rod of mass m and length is clamped The rod lies on a smooth horizontal surface and rotates on it about the clamped end at a uniform angular velocity w The force exerted by the clamp on the rod has a horizontal component 1 mo 2 zero 3 mg 1 TH mo l 2

A super ball is to bounce elastically back and forth between two rigid walls at a distance d from each other Neglecting gravity and assuming the velocity of super ball to be v horizontally the average force being exerted by the super ball on each wall is 1 mv 8 2 d 2mv 1 4 mv 0 d 4mv

Two springs of the same material but of length L and 2L are suspended with masses M and 2M attached at their lower ends Their time periods when they are allowed to oscillate will be in the ratio 1 2 3 1 4 a Eeeeeeeee reeeeeeee b 2M 7 2 2L 2 2 1 4 4 1

Electromagnetic wave consists of periodically oscillating electric and magnetic vectors In mutually perpendicular planes but vibrating with a phase difference of In mutually perpendicular planes but vibrating with a phase difference of TU 2 In randomly oriented planes but vibrating in phase In mutually perpendicular planes but vibrating in phase

Two similar circular coaxial loops carry equal currents in the same direction If the loops are brought nearer what will happen Current will increase in each loop Current will decrease in each loop Current will remain same in each loop Current will increase in one and decrease in the other

The temperature coefficient of resistance for a conductor at 0 C is 0 0125 C If the resistance at 300K is R then temperature at which the resistance becomes doubled is A 407K B 802K C 647K D 600K

A bus is running along a highway at a speed of 20 m s A man is at a distance of 100 m from the highway and 400 m from the bus at an instant Find the minimum speed of running in m s so that the man could catch the bus

Binding Energy per nucleon of a fixed nucleus X is 6 MeV It absorbs a neutron moving with KE 2 MeV and converts into Y at ground state emitting a photon of energy 1 MeV The Binding Energy per nucleon of Y in Me is O 64 1 A 1 C O 64 1 4 1 O T

Consider the situation shown in the figure The capa A has a charge q on it whereas B is uncharged The charge appearing on the capacitor B a long time after the switch is closed is Zero H Bedfo www A 2 q 2 B F

2 An ideal gas undergoes a cyclic process as shown in the graph between pressure P and temperature 7 The part of the graph which represents absorbtion of heat from surrounding are P 5 Povo 1 AB CD P P A B 1 2 T T T 2 DA BC AD

Time period of oscillation of rain drop depends on surface tension S density p and radius r Then time period T is Proportional to p Proportional to Proportional to Proportional to 19 100 310

The p d across the terminals of the battery is 9V when a current of 3A is in th battery from negative to positive terminal When a current of 2A is in reverse direction the p d across the battery is 12V The emf and internal resistance o cell is A 54 5 V 3 5 Q B 3 5 V 54 5 Q C 11V 2 3Q D 3V

A metal conductor of length 1 m rotates in vertical plane about one of its ends at angular velocity 5 radian per second If the horizontal component of earth s magnetic field is 0 2 x 10 4 T then the emf developed between the two ends of the conductor is 5 V 5 V 5 mV

For superposition of two waves in interfe 1 They must have equal frequency and wave length 2 They must have equal frequency but may have unequal wavelengths 3 They must have the same wavelength but may have different frequencies 4 They must have neither equal frequencies nor

lon of radius R in which uniform magnetic field increasing at a constant rate dB dt from the centre is 1 2 3 a The induced electric field at a distance r ar 2 aR 2r ar 2 ar x X X X X X X X X X X xxxx xx X X X X X X X X X X X X XXX for all values of r X for r Rand X for all values of r aR 2r aR for r R for r R 1 r 3 87 Cha In the A is

Two isolated charged metallic conductors of capacitance C and C having charges Q and Q respectively are connected to each other After connection there is No change in the energy of the system An increase in the energy of the system Always a decrease in the energy of the system A decrease in energy of the system except when qC q C

The phase difference between current and voltage in an AC T circuit is radian If the frequency of the AC used is 50 Hz 4 then the phase difference is equivalent to the time difference 0 78 ms O 7 8 ms 0 25 ms 2 5 ms

8 It is a method that is conducted in laboratories wherein the sample or specimen is being evaluated a census b experimentation c interview d observation 3 It refers to the whole set of individuals objects measurements and happenings a census b population c sample d statistics

Two forces in the ratio 1 2 act simultaneously on a particle The resul these forces is three times the first force The angle between two ford 0 60 45 90

The condition under which a microwave oven heats up a food item containing water molecules most efficiently is The frequency of the microwaves has no relation with natural frequency of water molecules Microwaves are heat waves so always produce heating Infrared waves produce heating in a microwave oven The frequency of the microwaves must match the resonant frequency of the water molecules

The tangential component of acceleration of a particle in circular motion is due CO Speed of particle Change in the direction Change in magnitude of velocity min se Rate of change of acceleration

7 A particle moves with a constant velocity parallel to the X axis Its angular momentum with respect to the origin 1 is zero 3 goes on increasing 2 remains constant 4 goes on decreasing

12 A particle performing SHM is found at its equilibrium at t 1 sec and it is found to have a speed of 0 25 m s at t 2 sec If the period of oscillation is 6 sec Calculate amplitude of oscillation T 3 1 m 2 3 2 m 41 6 3 m T 4 S mla 3 6 251 13 A t 2 1

From V IR it can be said that current density is proportional to A conductivity of a metal B electric field D neither A nor B Kirchoff s first law is a law of conservation of C both A and B