Question # 1

One electron volt is equal to

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1.6 x 1019eV

6.25 x 1018 eV

1.6 x 1018 eV

6.25 x 1019eV

The heat required to raise the temperature of one mole of the gas through 1 K at constant volume is called

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heat capacity

specific heat capacity

molar specific heat

molar specific heat at constant volume

The working of all DC electric meters (galvanometers, ammetersand voltmeters) depends upon

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Heating effect of current

Chemical effect of current

Magnetic effect of current

Electromagnetic effect of current

The total work done in moving the body up and then down through the same height in a gravitational field is equal to:

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mgh

Its wight

Weight X height

Zero

If the velocity of the body decreases non-uniformly then the slope of the velocity-time graph will have

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different values

same values

zero valves

constant valves

Which of the following diodes can operate in the reverse biased condition

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photo diode

light emitting diode

photo voltaic cell

none of these

Centripetal force for electron is given by

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mv²/ r

mv / r²

mv²/ r

mr²/ v

The results of spectra obtained by Balmer were expressed in 1896 by:

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Bohr

Rydberg

Planck

Rutherford

Coulomb

The device in which induced emf is statically induced emf is:

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Transformer

AC generator

Alternator

Dynamo

Which one is the least multiple

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Pico

Femto

Nano

Atto

When the speed of a body in a fluid increases then the drag force

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decreases

becomes zero

increases

non of them

When a platinum wire is heated, it appears dull red at about

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500°C

900°C

1100°C

1300°C

The current that flows through the coil of a motor causes:

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Its shaft to revolve

Its brushes to rotate

Motor to move

Its shafts to rotate

None of these

There is no way to detect:

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Absolute uniform motion

Accelerated motion

State rest

State of motion

None of these

In a metal, the valence electrons are:

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Attached to individual atoms

Not attached to individual atoms

Free to move within the metal

Both A and B

Both A and C

The nucleous of uranium -235 differs from a nucleous of a uranium -238 in that the later contains

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3 more neutrons

3 more electrons

3 more protons

3 more ions

If the distance between two charges is doubled, the force between them will become

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Double

Half

Three times

One fourth

One third

The unit of conductance is

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ohm

meter

mho

ohm-meter

Direction of motion_______ in circular of motion:

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Changes off and on

Changes continuously

Does not change

None of them

Density of fluid is defined as:

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Its volume to mass ratio

Product of volume and mass

Its mass of volume ratio

None of these

Unless stated otherwise, when we speak of A.C. meter reading, we usualy mean:

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Peak value

RMS value

Instantaneous value

Peak-to-peak value

Both (A) and (C0

Blood is an

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Compressible fluid

incompressible fluid

hard

none of them

A two Kg block is held 1 m above the floor for 50 seconds, the work done is:

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Zero

10.2 J

100 J

980 J

The induced current in a conductor depends upon

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Resistance of the loop

Speed with which the conductor moves

Any of these

Both A and B

None of these

Origin of the electric and the gravitational forces

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Was known in 1911 A.D.

Was known in 1811 A.D.

Was known in 1711 A.D.

is still unknown

Was known in 1611 A.D.

The amplitude of oscillation of each atom in a metallic crystal rises with the

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rise in temperature

decrease in temperature

even temperature remains constant

all of them

The temperature scale approved in SI units is:

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Celsius scale

Kelvin scale

Fehrenheit scale

None of these

When a dielectric material is introduced between the plates of a charged condenser the electric field between the plates

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Decreases

Increases

No change

May increase or decresase

No spark plug is needed in

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petrol engine

diesel engine

both of them

none of them

The electric potential at the surface of an atomic nucleus (Z = 50) of radius 9.0 x 10^-15is

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9 x 10⁵V

9 V

8 x 10⁶V

80 V

The focal length of convex lens having magnifying power of 5.55 is:

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5.5 cm

5 cm

4.5 cm

6 cm

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