Question # 1

When a body is moving on a surface, the force of friction is called

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Static friction

Dynamic friction

Limiting friction

Rolling friction

The work done on the system by the environment is considered as

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positive

negative

zero

any one of them

A metastable stae:

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Is an excited state

Is that in which excited electron is stable

Is that in which excited electron is usually unstable

Means a time interval of 10^-8second

Both (A) and (C)

Acceleration of the mass at any instant is given by

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a=k/m x

a= - m/k x

a = - k/m x

a=m/k x

To designate the voltage as low or 0 by a logic gate, the specified minimum value is:

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0.2 volt

0.8 volt

0 volt

2.0 volt

5.0 volt

In a transistor, collector current is controlled by

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Collector voltage

Base current

Collector resistance

All of the above

In case of constructive interference of two waves, the amplitude of the resultant wave is _______ either of the waves:

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Greater than

Equal to

Smaller than

None of these

The SI unit of strain is

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N

Dynes

Pascal

Dimensionless

If the vector 5 N lies along with x-axis, then its component along y-axis will be:

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Zero

5 N

7 N

10 N

The unit of decay constant is

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sex

sec²

sec^-1

sec^-2

A capacitor is charged with a battery and then it is disconnected. A slab of dielectric is now inserted between the plates, then

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The charge in the plates reduces and potential difference increase

Potential difference between the plates increase, stored energy decreases and charge remains the same

Potential difference between the plates decreases and charge remains unchanged

None of the above

The cohesive forces between atoms, molecules or ions in crystalline solids maintain

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short range order

long range order

both of them

none of them

If the mass of earth becomes four times to its initial value than the value of g will be

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Does not change

Becomes four time

Become one fourth of its initial value

None of these

Smaller the least count of the instrument more is the measurement

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Accurate

Precise

Accurate and precise

None of these

If the velocity of a body changes by equal amount in equal intervals of time, the body is said to have

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acceleration

uniform acceleration

instantaneous acceleration

uniform velocity

Pressure exerted by a gas in merely momentum transferred to the walls due to the continuous collisions of molecules of the gas

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Per unit area

Per sec per unit area

Certain area

None of these

The unit of power of a lens is

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Meter

Watt

Horsepower

Dioptre

A polaroid is:

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An adjustable shutter

A device used to analyze polarized light

A device used in polarimeter

A light filter

By the use of angular variable we can describe the

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Linear motion of a body

Angular motion of a body

Both

None of these

The components of a fibre optic communication system is/are

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At transmitter

An optical fibre

Receiver

All of these

A capacitor of capacity 1 μF is charged to 1 kV.The energy stored in J

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5

0.5

0.005

50

The rate of decay radioactive substance:

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Is constant

Decrease exponentially with time

Varies inversely with time

Decrease linearly with time

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