Question # 1

Solar cell converts sunlight directly into

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potential energy

thermal energy

mechanical energy

electrical energy

The way through which electromagnetic radiations or photons interact with matter depends upon their:

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Wavelength

Frequency

Energy

Temperature

All of these

Which one of the following is the unit of electric field intensity

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JC^-1

Vm^-1

Cm^-1

CJ^-1

Newton published laws of motion in his famous book "principia" in

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1867

1667

1676

1687

When the p-n junction is forward biased its resistance is of the order of

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few mega ohms

few kilo ohms

few ohms

few milli ohms

In the equilibrium state, the potential difference between two ends of the conductor moving across a magnetic field is called:

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Motion emf

Electrostatic emf

Induced emf

Both A and B

Both A and C

Force is a:

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Scalar quantity

Base quantity

Derived quantity

None of these

The example of reversible process is

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an explosion

changes occur suddenly

slow compression of a gas

all of them

the current is pass through the straight wire. The magnetic field established around it has its lines of force:

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Circular and endless

Oval in shape and endless

Straight

Parabolic

All are true

The branch of physics which is mainly concerned with the motion of bodies under the action of forces is called:

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Optics

Mechanics

Thermodynamics

Astro physics

In a container having water filled up to a height h, a hole is made in the bottom. The velocity of water flowing out of the hole is

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Independent of h

Proportional to h^1/2

Proportional to h

Proportional to h²

According to the special theory of relativity, time is

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absolute quantity

not absolute quantity

constant quantity

none of these

The Space around the Earth within which it exerts a force of attraction on other bodies is known as

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Nuclear field

Conservative field

Electric field

Gravitational field

The SI unit of spring constant is identical with that of:

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Force

Surface tension

Pressure

Loudness

The velocity of falling raindrop attains limited value because of

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Up trust of air

Viscous force exerted by air

Surface tension effect

Air currents atmosphere

The wave form of SHM is

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Pulsed wave

Square wave

Triangular waved

Sine wave

The A.M. transmission frequency range from

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500-1000 KHz

540-1600 KHz

300-490 KHz

900-2040 KHz

Uncertainty is of following type/types:

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Absolute

Fractional

Percentage

All of these

Due to the high value of the input resistance, practically, the value of the current which flows between the input terminals is

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zero

small

large

very large

Phenomenon of radioactivity is due to disintegration of

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nucleus

neutron

proton

molecule

The work done by a force keeping an object in circular motion with constant speed is:

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Zero J.

0.1 J

1 J

0.01 J

Decibel is unit of

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Intensity of light

x-ray radiation capacity

sound loudness

Energy of radiation

For maximum linear distance of travel, a projectile must be fired at an angle of

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0°

45°

90°

60°

Blood pressure is measured by the instrument

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stethoscope

sphygmomanometer

barometer

none of them

The impedance of RLC series resonance circuit at resonant frequency is

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Greater than R

Equal to R

Less than R

None of these

Structure of the nucleus was explained by

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J.J Thomson

Bohr

Millikan

Rutherford

Absolute zero is considered as that temperature at which:

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All liquid become gases

All gases become liquid

Water freezes

None of these

Two samples A and B of a gas initially of the same temperature and pressure are compressed from a volume V to a volume V/2 such that A is compressed isothermally and B adiabatically. The final pressure

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A greater than than of B

A is equal to that of B

A is less than that of B

A is twice the pressure of B

The value of electrical constant of proportionality k is

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9 x 10⁹Nm²C^-2

9 x 10^-9Nm²C^-2

9 x 10¹⁰Nm²C²

9.85 x 10^-12N^-1C^-2

The bob of a simple pendulum is suspended by

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string

heavy inextensible string

light extensible string

light inextensible string

The time taken to complete one vibration is called:

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Frequency

Amplitude

Time

Time period

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