Question # 1

Base current of a transistor is 1 mA and collector current is 99 mA What is emitter current.

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1 mA

100 mA

98 mA

110 mA

Which of the following are particle accelerators.

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Cyclotrons

Synchrotrons

Linear accelerators

All of the above

The path of a projectile is a

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Straight line

Circle

Ellipse

Parabola

When white light is incident on a diffraction grating, the light that will eb deviated from central image will be.

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White

Yellow

Red

Blue

Image formed by a concave lens is.

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Real

Magnified

Virtual

Real and magnified

In fission reaction, heavy water is used as a

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Coolant

Moderator

Heat exchanger

Controller of reaction rate

A wave that consists of oscillations occurring perpendicular to the direction of energy transfer is called.

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Transvers wave

Longitudinal wave

Stationary wave

Shock wave

An operational amplifier can be used as a

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Comparator

Night switch

Inverting and non inverting amplifier

All of the above

In microwave ovens, heating is produced by the phenomena of

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Reflection

Refraction

Damped oscillations

Resonance

If the earth stopped rotating the weight of objects at either pole would.

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Be grater

Be less

Vary with altitude

Be the same before

The half life of radium -226 is

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1620 years

45 x 10⁹ years

3.8 days

23.5 minutes

In which reaction two or more small light nuclei nuclei come together or fuse to form a large nucleus.

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Radioactivity

Radioactivity dating

Nuclear fusion

Nuclear fission

A sheet of transparent material with many fine equally spaced lines ruled parallel on its surface is called

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Interferometer

Grating element

Ruler

Patch

A wave that remains in a constant position is called.

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Standing wave

Transvers wave

Shock wave

Longitudinal wave

When light enters glass from air it suffers a change in.

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Wavelength

Wave front

Velocity

All of these

On increasing the temperature of source efficiency of Carnot engine.

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Increase

Decrease

First increases and then decreases

Does not change

The ideal thermal efficiency of a cyclic heat engine is limited by

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Friction in the engine

Amount of heat in the engine

Difference between input temperature and output temperature.

Amount of work

What is the scale for measurement of Banbridge mass spectrograph.

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Linear

Inverse

Exponential

Logarithmic

in the region where the field lines are parallel and equally spaced, the field is.

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Zero

Unirorm

Non uniform

Negative

Which of the following quantity in analogous to temperature in electricity.

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Charge

Resistance

Inductances

Potential

When damping is small amplitude of vibrational resonance will be

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small

Large

Infinite

Un changed

The term radius of gyration relates to.

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Moment of force

Moment of inertia

Law of gravitation

simple harmonic motion

The Inner electrons in heavy atoms can be disturbed and dislodged by.

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X rays

Alpha particle

Beta particles

gama particles

The amplitude of a vibrating body placed in a resistive medium.

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Increases exponentially with time

Decreases exponentially with time

Remains constant with time

Cannot be observed

Rate of flow of a liquid is expressed in

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Litre m-3

Litre s-1

Litre m-1

Litre s

Electromotive force is closely related to.

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Inductance

Magnetic flux density

Potential difference

Electric field intensity

When a force is applied on a body several effects are possible which of the following effect could not occur.

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The body speeds up

The body changes direction

The pressure on the body increases

The mass of the body decreases

Blue colour of sky is due to.

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Diffraction

Reflection

Polarization

Scattering

One radian is equl to

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57.3 ^o

67.3 ^o

60 ^o

87.3 ^o

A small and a large rain drops are falling thgouth all.

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Large drop falls faster

Both move with same velocity

Small drop falls faster

Small drop does not fall

According to Gauss's law the number of electric field lines crossing any closed surface is.

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numerically equal to the enclosed charge

Equal to the enclosed positive charge

Equal to teh electric field inside the surface

Equal to the charge density on the surface.

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