Question # 1

First law of thermodynamics tells us that heat energy can be converted into equivalent amount of work, but it is silent about

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how heat is absorbed

how heat extracted

how this conversion takes place

none of them

Electric lines of force

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Intersect each other

Are always parallel

Are always anti-parallel

Never intersect

None of these

One KWh is equal to:

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3.6 x 10²J

3.6 KJ

3,6 x 10¹KJ

3,6 MJ

Motional emf is called motional:

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Electromagnetic force and is measured in newtons

Electromotive force and is measured in volt

Electromotive force and is measured in newtons

Electromagnetic force and is measured in volts

None of these

A non-inertial frame of reference is one, in which

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law of inertial is valid

all laws of physics are the same in all frames

a>0 or a<0

a=0

Instead of moving the coil towards a magnet, the magnet is moved towards the coil with the same speed. The galvanometer shows current:

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Of same magnitude in the same direction

Of different magnitude in the same direction

Of same magnitude but in opposite direction

Of different magnitude in the opposite direction

None of these

To make an LED, it is impreacticable to use:

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Silicon

Gallium arsenide

Gallium arsenide phosphide

Iron

Both (B) and (C)

The machines which deals with the objects moving with velocities approaching that of light is called:

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Relativistic mechanics

Wave mechanics

Quantum

Statics mechanics

In stationary waves

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Energy is uniformly distributed

Energy is minimum at nodes and maximum at antinodes

Energy is maximum at nodes and minimum at antidotes

Alternating maximum and minimum energy producing at nodes and antinodes

The law of conservation of mass gives us the

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equation of continuity

Bernoulli's theorem

both of them

none of them

Most practical application of electricity involve

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Charges at the rest

Charges in the motion

Electrons at rest

Atoms in motion

Molecules in motion

Thermodynamics is the branch of physics deals with the conversion of heat energy into

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Electrical energy

Mechanical energy

Solar energy

None of these

The materials which are used in selective absorption method to polarize the light are

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chronic substances

organic substances

inorganic substances

diachronic substance

Which of the following is a scalar quantity

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Density

Displacement

Torque

Weight

Viscosity of glycerin at 30^oC in Nsm^-2

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6.12 × 10^-3

6.18 × 10^-3

6.29 × 10^-3

6.79 × 10^-3

An object moving with acceleration g is said to fall freely identify freely falling objects from the list given below

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An orange falling from a tree

A satellite orbiting around the earth

A football kicked in the air

All of these

The dimensions of ½at²are of

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length

Velocity

Acceleration

TIme

While passing through the atmosphere, total energy is reduced by the dust particles, water vapours and other gases due to

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Reflection

Scattering

Absorption

All of these

Which one is numeric quantity?

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Strain

Plane Angle

Impulse

both A and B

The equation representing the inter conversion of matter and energy is written as

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E = mc

E = mc²

E = mc³

None of these

If the potential difference across the two plates of a capacitor is double, then its energy stored in will be

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2 times

5 times

4 times

Remains the same

A pulsating DC can be converted into constant voltage by using

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Filter

Full wave rectifier

Half wave rectifie

Bridge rectifier

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