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Physics

Question 1 of 21

Medal-premium 1

Four charges 2C,-3C,-4C and 5C respectively are placed at all the corners of a square. Which of the following statements is true for the point of intersection of the diagonals

Select one of the following:

  • Electric field is zero but electric potential is non-zero

  • Electric field is non-zero but electric potential is zero

  • Both electric field and Electric Potential Are Zero

  • Neither electric field nor electric potential are zero

Question 2 of 21

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If two like charges of magnetic 1x10^-9 coulomb and 9x10^-9 coulomb are separated by a distance of 1 metre then the point on the line joining the charges, where the force experienced by a charge placed at that point is zero is:

Select one of the following:

  • 0.25m from the charge 1x1^-9 coulomb

  • 0.75m from the 9x10^-9 coulomb

  • both 1) and 2)

  • at all points on the line joining the charges

Question 3 of 21

Medal-premium 1

Four charges 2C,-3C,-4C and 5C respectively are placed at all the corners of a square. Which of the following statements is true for the point of intersection of the diagonals

Select one of the following:

  • Electric field is zero but electric potential is non-zero

  • Electric field is non-zero but electric potential is zero

  • Both electric field and Electric Potential Are Zero

  • Neither electric field nor electric potential are zero

Question 4 of 21

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The flux entering and leaving a closed surface are 5x10^5 and 4x10^5 MKS unit respectively , then the charge inside the surface will be

Select one of the following:

  • -8.85x10^-7

  • 8.85x10^-7

  • 8.85x10^7

  • 6.85x10^-7

Question 5 of 21

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Two particles of masses m and 2m with charges 2q and 2q are placed in a uniform electric field E and allowed to move for the same time. The ratio of their kinetic energies will be

Select one of the following:

  • 2:1

  • 8:1

  • 4:1

  • 1:4

Question 6 of 21

Medal-premium 1

The core of a transformer is laminated so that

Select one of the following:

  • ratio of voltage in the primary and secondary may be increased

  • energy losses due to eddy currents may be minimised

  • weight of transformer may be reduced

  • rusting may be prevented

Question 7 of 21

Medal-premium 1

The masses of three wires of copper are in the ratio of 1:3:5 and their lengths are in he ratio 5:3:1. The ratio of their electrical resistances is

Select one of the following:

  • 1:3:5

  • 5:3:1

  • 1:15:125

  • 125:15:1

Question 8 of 21

Medal-premium 1

An electric current is passed through a circuit containing two wires of the same material connected in parallel. If the length and radii of the wires are in the ratio of 4/3 and 2/3 , then the ratio of currents passing the wires will be

Select one of the following:

  • 3

  • 1/3

  • 8/9

  • 2

Question 9 of 21

Medal-premium 1

Energy is stored in the choke coil in the form of

Select one of the following:

  • heat

  • electric energy

  • magnetic energy

  • e.m energy

Question 10 of 21

Medal-premium 1

If a wire is stretched to make it 0.1% longer, its resistance will

Select one of the following:

  • Increases by 0.05%

  • increases by 0.2%

  • decreases by 0.2%

  • decreases by 0.05%

Question 11 of 21

Medal-premium 1

In a closed circuit, the current I(in ampere) at an instant of time t(in seconds) is given by: I=4-0.08t. The number of electrons flowing in 50s through the cross- section of the conductor is

Select one of the following:

  • 1.25x10^19

  • 6.25x10^20

  • 5.25x10^19

  • 2.25x10^20

Question 12 of 21

Medal-premium 1

A long solenoid has 200 turns per cm and carries a current I. The magnetic field at its center is 6.25x10^-2 Weber/m2. Another long solenoid has 100 turns per cm and it carries a current i/3 . the value of the magnetic field at its centre is

Select one of the following:

  • 1.05x10^-4W/m^2

  • 1.05x10^-2W/m^2

  • 1.05x10^-5W/m^2

  • 1.05x10^-3W/m^2

Question 13 of 21

Medal-premium 1

The core of a transformer is laminated so that:

Select one of the following:

  • ratio of voltage in the primary and secondary may be increased

  • energy losses due to eddy currents may be minimised

  • weight of transformer may be reduced

  • rusting may be prevented

Question 14 of 21

Medal-premium 1

A coil of 20x20cm having 30turns is making 30rps in a magnetic field of induction 1 T. The peak value of the induced emf is approximately ‘

Select one of the following:

  • 452volt

  • 226volt

  • 113volt

  • 339volt

Question 15 of 21

Medal-premium 1

A horizontal telegraph wire 0.5km long running east and west is a part of a circuit whose resistance is 2.5 . The wire falls to the ground from a height of 5m. If g=10.0m/s^2 and B=2x10^-5weber/m^2 , then the current induced in the circuit is

Select one of the following:

  • 0.7amp

  • 0.04amp

  • 0.02amp

  • 0.01amp

Question 16 of 21

Medal-premium 1

The mutual inductance of a pair of coils if a current of 3 ampere in one coil causes the flux in the second coil of 2000 turns to change by 6x10^-4weber per turn of the secondary coil is

Select one of the following:

  • 4X10^-4henry

  • 2x10^-4henry

  • 0.4henry

  • 4henry

  • all the above

Question 17 of 21

Medal-premium 1

use of eddy currents is done in the following except

Select one of the following:

  • moving coil galvanometer

  • electric breaks

  • induction motor

  • dynamo

Question 18 of 21

Medal-premium 1

A transparent cube of 15cm edge contains a small air bubble. Its apparent depth when viewed through one face is 6cm and when viewed through the opposite face is 4cm. Then the refractive index of material of the cube is

Select one of the following:

  • 2.0

  • 1.5

  • 1.6

  • 2.5

Question 19 of 21

Medal-premium 1

To obtain a parallel reflected beam from a torch , he reflector of the torch should be

Select one of the following:

  • plane mirror

  • spherical mirror

  • parabolic mirror

  • all of these

Question 20 of 21

Medal-premium 1

A man standing in front of a concave spherical mirror of radius of curvature 120cm sees an erect image of his face four times is natural size. Then the distance of the man from the mirror is

Select one of the following:

  • 180cm

  • 300cm

  • 240cm

  • 45cm

Question 21 of 21

Medal-premium 1

microscope has an objective of local length 1.5cm and an eye –piece of focal length 2.5cm. If the distance between objective and eye-piece is 25cm. what is the approximate value of magnification produced for relaxed eye?

Select one of the following:

  • 75

  • 110

  • 140

  • 25

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raghu Katagall
Quiz by , created 4 months ago

Quiz on Physics, created by raghu Katagall on 11/09/2017.

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raghu Katagall
Created by raghu Katagall 4 months ago
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