Question # 1

In a transistor, collector current is controlled by

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Collector voltage

Base current

Collector resistance

All of the above

An electric charge at rest is

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Only an electric field

Only a magnetic field

Both electric and magnetic fields

None of the above

The weight 'mg' of the bob is resolved into

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one component

two components

three components

four components

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

In an adiabatic expansion, the temperature of the gas

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increases

becomes zero

decreases

decreases rapidly

Light waves are:

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Transverse wave

Longitudinal wave

Compressional wave

None of them

It is possible to recognize a person by hearing his voice even if he is hidden behind a solid wall. This is due to the fact that his voice

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Has a definite pitch

Has a definite quality

Has a definite capacity

Can penetrate the wall

Amount of heat required to raise the temperature of a body through 1 K is called its

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Specific heat

Water equivalent

Thermal capacity

Entropy

Magnetic flux passing through a element whose vector area makes an angle0º with lines of magnetic force is:

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BACosѲ

Zero

BA

BA sinѲ

None of these

The minimum wavelength of X-rays produced of 1KV potential difference is applied across the anode and cathode of the tube is

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1.24 x 10^-10m

7.92 x 10^-20m

2.78 x 10^-14m

3.88 x 10^-11m

The terminal velocity of a small size spherical body of radius R moving in a fluid varies as

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R

R²

1/R

(1/R)²

The force required to bend the normally straight path of the particle into circular path is called

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Applied force

Normal force

Reactional force

Centripetal force

Gain of operational amplifier is independent of;

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Internal structure

External Structure

Batteries

Potential changes

The SI units of the intensity of light are

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Lux

candela

Pois

None of these

One kilowatt hour is equal

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3.5 × 10⁵ J

3.6 × 10⁸ J

3.6 × 10⁶ J

3.5 × 10⁶ J

By dimensional analysis, we can find

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Correctness of formula

Derivation of formula

Physical nature

All of these

The least distance of distinct vision changes with

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Time

Health

illness

Age

If C and R denote capacity and resistance,the dimensional formula of CR is

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M°L°T^-1

M°L°T°

Not expressible in terms of MLT

A mental wire is stretched by suspending weight to if x is the longitudinal strain and y is young s modulus of elasticity then the elastic potential energy per unit volume is

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1/2 y x²

x² / 2y

y² / 2x

x² / 2y

The ballistic missiles are useful for

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Short ranges

Long ranges

Medium ranges

None of these

The SI unit of strain is

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N

dynes

pascal

dimensionless

Domains are present only in

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Diamagnetic material

Para magnetic material

Ferromagnetic material

All of these

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