Question # 1

A charge Q is divided into two parts q and Q - q and separated by a distance R. The force of repulsion between them will be maximum when

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q = Q/4

q = Q/2

q = !

None of these

When heat is added into the system then change in entropy is

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negative

positive

zero

any one of them

Step up transformer has a transformation ratio of 3:2. What is the voltage in secondary, if voltage in primary is 30V:

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45 V

15 V

90 V

300 V

A flowing liquid possess

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K.E

P.E

Pressure Energy

All

If N is the total number of molecules and V is the volume of the container, then the expression for the pressure of gas is

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P=P/V<1/2mv²>

P=2N/V<1/2mv²>

P=2/3N/V<1/2mv²>

P=2/3N/V<mv²>

A wire of radius r has resistance R. If it is stretched to a wire of r/2 radius, then the resistance becomes

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2R

4R

16R

Zero

The range ofβ-particle in air is greater than that ofα-particle by

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1000 times

100 times

15 times

10 times

Experiments revealed that the ratio of the stress to the strain is a constant value for

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different material

all materials

a given material

all of them

The current is measured in

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volts

watt

ampere

ohm

The quantity F x t is called as

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momentum

velocity

acceleration

impulse

The capacitance of a parallel plate capacitor depends upon

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Area of the plates

Separation between the plates

Medium between the plates

All of the above

For making cooking utensils, which of the following pairs of properties is most suited?

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Low specific heat and high conductivity

Low specific heat and low conductivity

High specific heat and high conductivity

High specific heat and low conductivity

When current passes through a solenoid coil, it behaves like a

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loop

circle

bar magnet

none of these

If the time period a simple pendulum is 2 s, its frequency would be

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2 Hz

1.5 Hz

1.0 Hz

0.5 Hz

While describing the motion of a simple pendulum, the frictional effects are

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taken into account

completely ignored

partially ignored

none of them

Curie is a unit of

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reluctance

resistivity

binding energy

radioactivity

A point charge A of charge +4μC and another B of charge -1μC are placed in air at a distance 1 m apart. Then the distance of the point on the line joining the charge B, where the resultant electric field is zero, is (in m)

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2

1

0.5

1.5

The temperature at which the vibrations become so great that structure of the Crystal breaks up, is called:

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Critical temparature

Temperature of vaporization

Melting point

Both (A) and (C)

Both (A) and (B)

Fog droplets are suspended in air when their weight is balanced by:

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Force of gravity

Upward trust due to air

Surface tension

None of these

The penetration power ofβ-particle is

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zero

less thanα-particle

equal toα-particle

greater thanα-particle

In half wave rectification

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both halves of the input voltage is used

only one half of the input voltage is used

either of these

none of these

If one of the pipes has a much smaller diameter than the other and are placed horizontally then form both sides of Bernoulli's equation, we can drop the term

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P

1/2 fv²

pgh

none of them

In a metal, the valence electrons are:

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Attach to individual atoms

Not attached to individual atoms

Free to move within the metal

Both (A) and (C)

Both (B) and (C)

Wave disturbances may also come in a concentrated bundle, like shock wave from an aeroplane flying at

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subsonic speed

sonic speed

super sonic speed

any one of them

Mechanical waves on the surface of a liquid are

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Transverse

Longitudinal

Torsional

both transverse and longitudinal

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

The capacity of a parallel plat capacitor depends on the

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Type to metal used

Thickness of plates

Potential applied across the plates

Separation between the plates

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

Neutron was disvovered by:

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Rutherford in 1920

Chadwick in 1922

Bohr in 1913

Compton in 1927

None of these

The practical application of the phenomenon of Mutual induction is

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Transformers

Generator

Motor

All of these

Fluids can transmit:

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Transverse wave

Compressional wave

Both of them

None of them

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