Question # 1

the current is pass through the straight wire. The magnetic field established around it has its lines of force:

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Circular and endless

Oval in shape and endless

Straight

Parabolic

All are true

The concept of entropy was introduced into the study of thermodynamics in

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1856

1865

1656

1685

Einstein's theory about gravity if better than Newton's because it gave explanation of:

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Inverse square law

Bending of light

Both A and B

None of above

For multiplication and division purposes, percentage uncertainties are:

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Add

subtracted

Multiplied

Divided

The heat required to raise the temperature of one mole of the gas through 1 K at constant volume is called

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heat capacity

specific heat capacity

molar specific heat

molar specific heat at constant volume

Which of the following does not obey ohm's law?

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Copper

Al

Diode

None

When the magnitude of two component vectors are equal to that of their resultant, then the angle between the components is:

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60°

90°

120°

150°

A dimension stands for the ___________ nature of certain physical quantity.

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super

Quantitative

Qualitative

Both B and C

There is present in paraffin a large amount of:

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Nitrogen

Hydrogen

Carbon

Baryllium

Lithium

Which of the following quantity for particle executing SHM is non-zero at mean position

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Force

Acceleration

Velocity

Displacement

The galvanometer can be made sensitive if the value of the factor C/BAN is

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constant

small

large

none of these

By which principle we can locate the position of new wavefront after a later time?

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principle of irreversibility

principle of light

Archimedes principle

Huygen's principle

In an optical fibre the speed of light is

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Directly proportional to its refractive

Inversely proportional to its refractive inedex

Independent of refractive index

Directly proportional to square of refractive index

Semi-conductor elements have atoms with

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2 valence electrons

3 valence electrons

4 valence electrons

5 valence electrons

Which of the following sets of concurrent forces may be in equilibrium?

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F₁ - 3 N,F₂ - 5 N,F₃ = 6 N

F₁ - 3 N,F₂ - 5 N,F₃ = 15 N

F₁ - 3 N,F₂ - 5 N,F₃ = 1 N

F₁ - 3 N,F₂ - 5 N,F₃ = 9 N

Which light travels faster in optical fibres?

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visible light

ultraviolet

infra-red

any one of them

If (a x b) points along positive z-axis,then the vectors a and b must lie in.

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yz-plane

zx-plane

xy-plane

None of the above

If we keep the moment arm constant and increase the applied force, then the torque will

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remain the same

decrease

increase

all of them

In launch mass of the rocket fuel is

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70%

80%

More than 80%

None of these

1 torr = ______

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1.20 Nm^-2

1.38 Nm^-2

1.33 Nm^-2

1.31 Nm^-2

For maximum linear distance of travel, a projectile must be fired at an angle of

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0°

45°

90°

60°

The state of rest and state of motion are

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Irrelevant

Relative

Both

None of these

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