Question # 1

The coefficient of linear expansion of iron is 0.000011 per°K. An iron rod is 10 metre long at 27°C. The length of the rod will be decreased by 1.1 mm when the temperature of the rod changes to

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0°C

10°C

17°C

20°C

The unit of resistance is

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volt

ampere

ohm

coat

Fluids can transmit:

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Transverse wave

Compressional wave

Both of them

None of them

A projectile on its path gets divided into two pieces at its highest point. Which is true?

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Momentum increases

Momentum decreases

Kinetic energy increases

Kinetic energy decreases

Force is a:

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Scalar quantity

Base quantity

Derived quantity

None of these

Examples of polymeric substances are:

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Plastic

Synthetic rubbers

Zirconia

All of these

Both (A) and (B)

The charge carries in the electrolyte are:

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Positive ions

Negative ions

Either (A) or (B)

Both (A) and (B)

Neither (A) nor (B)

A wire is bent into a ring of radius R is given a charge q. The magnitude of the electrical field at the centre of the ring is

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Two

1/2

Zero

3/2

When a body is vibrating, the displacement from mean position

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Increases with time

Decreases with time

Changes with time

None of these

The maximum possible error in the reading of an instrument is ______ its least count.

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Half of

Quarter of

Equal to

Double than

Which of the following medium/media can transmit both transverse and longitudinal waves:

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Solids

Liquids

Gases

All of them

The basis to define a temperature scale that is independent of material properties is provided by

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carbon cycle

nitrogen cycle

Carnot cycle

irreversible cycle

The electric field lines start from:

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Positive charge

Negative charge

Either A and B

Neutron

An atom

If the absolute uncertainty of an instrument is 0.0a1 cm, then its least count will be :

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0.005 cm

0.01 cm

0.02 cm

0.001 cm

Nucleus consists of

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proton and neutron

protons and electron

electron and neutron

protons only

In the equation E=mc² value of c is?

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186000 miles per hour

186000 miles per sec

3 X 10⁸m/sec

Both A and C

Both B and C

The force which maintain the strict long-range order between atoms of a crystalline solid is the:

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Nuclear force

Cohesive force

Adhesive force

Coulomb force

None of these

Heavy water is made of one oxygen atom and two atoms of:

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Protium

Deuterium

Tritium

Any of these

None of these

If v is the velocity of flow of liquid through a tube of area of cross-section A, then according to equation of continuity

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v/A = constant

A/v = constant

Av = constant

None

The value of the plank's constant 'h' is given by

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1.6 x 10^-19J

1.67 x 10^-27Kg

6.63 x 10³⁴Js

6.63 x 10^-34Js

The force applied on unit area to produce any change in the shape, volume or length of a body is known as

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strain

elasticity

stretching

stress

Braking radiation causes:

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Continuous spectrum

Line Spectrum

Band spectrum

Discrete specturm

All of these

The substances in which, atom are so oriented that their fields support each other and the atoms behave like tiny magnets, are called

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diamagnetic substances

ferromagnetic substances

paramagnetic substances

all of them

A dirty carpet is to be cleaned by heating. This is an accordance with____ law of motion:

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First

Second

Third

None of these

A swing has

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one natural frequency

two natural frequencies

three natural frequencies

four natural frequencies

Hotness and coldness of an object is represented in terms:

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Heat

Temperature

Chemical energy

None of these

The example of mechanical wave is

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waves in ropes

waves on water surface

waves in air

all of them

A typical four stroke petrol engine undergoes how many successive processes in each cycle

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one

two

three

four

When we consider the average velocity of a body, then the body is moving in

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straight line

curved path

may be in a straight or curved path

none of them

When a silicon crystal is doped with a pentavalent element, then the atom of the pentavalent element is known as

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acceptor

donor

either of them

none of them

The colour sequence in a carbon resistor in red, brown, orange and silver. The resistance of the resistor is

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21 x 10³+ 10%

23 x 10¹+ 10%

21 x 10³+ 5%

12 x 10³+ 5%

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