Question # 1

If the number of turns of a solenoid (carrying a steady current I) is doubled without changing the length of a solenoid, then magnetic field:

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Becomes Half

Becomes double

Is not affected

Becomes one fourth

None of these

The reactance of a coil when used in the domestic A.C. power supply (220 volts, 50 cycles per second) is 50 ohms. The inductance of the coil is nearly

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2.2 henry

1.6 henry

0.22 henry

0.16 henry

As the bob of the pendulum moves to and fro which of the force is experienced by the bob

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its weight

tension in the string

viscous drag force by air

all of them

In above figures, tell which set of graphs shows that a body is moving with uniform velocity:

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(i) and (ii)

(ii) and (iii)

(iii) and (iv)

Density is defined as:

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Mass per volume

Volume per mass

Mass x volume

Mass per length

Which one of the following has larger value of relative permitivity E_rat room temperature?

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Vaccum

Air

Glass

Water

Magnetic induction is also called as:

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Ampere’s law

Faraday’s law

Lenz’s law

Newton’s law

Coulomb’s law

A field free region is found:

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Near the outer surface of a hollow charged metal sphere

In the interior of solid metal uncharged sphere

In the interior of solid metal charged sphere

Both (A) and (B)

Both (A) and (C)

The natural frequency of a pendulum which is vibrating freely, depends upon its

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mass

length

material

all of them

The un-steady streamline flow is called

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laminar flow

turbulent flow

both of them

none of them

In a three phase a.c generator if the first coil has a phase 0, then the other two coils will have phases

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90° - 120°

20° and 140°

120° and 240°

120° and 140°

The first super conductor was discovered in

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1811

1890

1901

1911

If a given spring of spring constant K is cut into two identical segments, the spring constant of each segment is:

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K/2

2 K

4 K

None of these

The property of light which does not change with the nature of the medium is:

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Frequency

Amplitude

Wavelength

None of these

A typical rocket consists of fuel

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more than 60% of launch mass

less than 60% of launch mass

less than 80% of launch mass

more than 80% of launch mass

Work is a Quantity

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Vector

Scalar

Non-physical

None of these

Referring to above figure, due to change in current in the coil P, the change in magnetic flux

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Is associated with coil P

Is associated with coil S

Causes and induced current in coil S

All of these

None of these

The S.I unit of frequency is

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Vibrations s^-2

Ms^-1

Hertz

s^-1

From sand, we get a material used for construction with the motion of bodies under the action of forces is called:

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Optics

Mechanics

Thermodynamics

Astrophysics

Conventional the angular Velocity is Directed at an angle of:

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90° to the axis of rotation

30° to the axis of rotation

0° to the axis of rotation

None of above

Particles have the mass smallest of following is

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Electron

Proton

Neutron

Quark

Which one of the following wave motions is transverse:

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Wave motion produced in water when a piece of stone is thrown into it

Pulling of weight hanging vertically with a spiral spring

Both of these

None of these

The SI unit of spring constant is identical with that of:

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Force

Surface tension

Pressure

Loudness

In the equilibrium state, the potential difference between two ends of the conductor moving across a magnetic field is called:

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Motion emf

Electrostatic emf

Induced emf

Both A and B

Both A and C

The restoring force is always directed towards:

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Rest position

Equilibrium position

Mean position

All of them

The best conductor is:

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Silver

Copper

Aluminimum

Both B and C

None of them

In the region surrounding a current carrying wire:

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A magnetic field is setup

The lines of force are elliptical

Direction of lines of forces depends upon direction of current

Both (A) and (C)

All of these

Internal friction of fluid is called

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Surface tension

Viscosity

Resistance

Cohesive force

The bands below the valence band are

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completely filled and play active part in conduction process

completely filled and plays no part in conduction process

completely filled and play active part in conduction process

not completely filled and play no part in conduction process

The pressure will change in the pipe, as the fluid moves through that pipe of varying

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cross-section

height

none of them

both of them

A cube of metal is given a positive charge Q. For the above system, which of the following statements is true?

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Electric potential at the surface of the cube is zero

Electric potential within the cube is zero

Electric filed is normal to the surface of the cube

Electric filed varies within the cube

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