Question # 1

Nowadays, Most of the electric energy is produced by the A.C. generators using:

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Hydal water

Geothermal energy

Solar energy

Biomass

Both (B) and (D)

Coulomb's force between two point charges depends upon

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Magnitude of charges

Distance between them

Medium in which they are located

All of the above

First law of thermodynamics is consequence of conservation of

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Work

Energy

Heat

All of these

The bonding between the semi-conductor materials is

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covalent

ionic

either of them

none of them

X-ray are also known as

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Roentgen rays

Maxwell rays

Plank range

Einstein rays

Which of the following is not an example of intertial frame

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a body placed on the surface of earth

a body placed in a car moving with uniform velocity

a body placed in a car moving with same acceleration

none of these

the symbol to be used in relativity problems denotes:

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Dilated time

Proper time

Life time

Half time

None of these

The statement "the electric force of repulsion or attraction between two point charges is directly proportional to the product of the charges and inversely proportional to square of the distance between them" refer to

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Coulomb's law

Gauss's law

Biot-Sarwat law

Ampere's law

Which quantity has different dimensions:

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Work

Pressure

Energy

Torque

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

Change in momentum is one second called.

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Impulse

Force

Energy

Work

One joule is equal to

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1.6 x 10¹⁹eV

6.25 x 10¹⁸eV

1.6 x 18¹⁸eV

6.25 x 10¹⁹eV

The product of the pressure and volume of an ideal gas is

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A constant

Approximately equal to the universal gas constant

Directly proportional to its temperature

Inversely proportional to its temperature

Drag force increases if speed of the object moving through the fluid:

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Increases

Decreases

Remains constant

None of these

In a semi-conductor material, current flows due to

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positive charge

negative charge

both of them

none of them

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

Which quantity has the same units as impulse

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force

work

linear momentum

acceleration

At the present time, the main frontiers of fundamental science are

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2

3

4

5

The resistivity of a substance depends upon the

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length

mass

area

temperature

In case of the three dimensional deformation, when volume is involved, the ratio of applied stress to volumetric strain is called

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Young's modulus

Bulk modulus

Shear modulus

all of them

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

Total number of turns on 0.15 m length solenoid is 300. the value of n is:

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Greater than 300

Smaller than 300

Equal to 300

Any of (A) or (B)

Any of (A) or(C)

Velocity of sound in a diatomic as is 300 m/sec. what is its rms velocity?

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400 m/sec

40 m/sec

430 m/sec

300 m/sec

At any point on the right bisector of the line joining two equal and opposite charges

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At electric field is zero

The electric potential is zero

The electric potential decreases with increasing distance from the centre

The electric field is perpendicular to the line joining the charges

A square loop of wire is moving through a uniform magnetic field. The normal to the loop is oriented parallel to the magnetic field. The emf induced in the loop is:

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Zero

Of smaller magnitude

Of larger magnitude

Sometimes B, sometimes C

Neither of these

Centripetal acceleration is also called _______ acceleration:

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Tangential

Radial

Angular

None of them

The unit of work in CGS system is

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Joule

Erg

Dyne

Watt

If force and displacement are in opposite direction, the work done is taken as:

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Positive work

Negative work

Zero work

Infinite work

The maximum possible error in the reading for a meter rod with least count 1 mm is:

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0.005 mm

0.05mm

0.5mm

5.0mm

Maximum density of H₂O is at the temperature

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32°F

39.2°F

42°F

4°F

The change of magnetic flux through a circuit will produce

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Magnetic Field

Electric Field

emf

a.c

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