Question # 1

Most practical application of electricity involve

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Charges at the rest

Charges in the motion

Electrons at rest

Atoms in motion

Molecules in motion

The first super conductor was discovered in

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1811

1890

1901

1911

The velocity of falling raindrops attains limited value because of

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Up thrust of air

Air currents of the earth atmosphere

Surface tension effect

Viscous force exerted by air

de-Broglies hypthesis was experimentally verified by

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Maxwell

Compton

Einstein

Davison and Germer

Three resistance 500,500 and 50 ohms are connected in series across 555 volts mains. The current flowing through them will be

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0.52 A

1 mA

0.7 mA

1.4 A

When resistance of a current carrying wire increases due to rise in temperature, the drift velocity of electrons:

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Decreases

Increases

Remains the constant

Either of these

None of these

Which one is related to angular motion:

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Moment of a force

Moment of inertia

Moment of momentum

None of these

A wire is bent into a ring of radius R is given a charge q. The magnitude of the electrical field at the centre of the ring is

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Two

1/2

Zero

3/2

According to the special theory of relativity, time is

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absolute quantity

not absolute quantity

constant quantity

none of these

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)

For a fixed force, larger is the mass of a body the

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greater is its acceleration

smaller is its acceleration

smaller is its weight

zero is its acceleration

Ultra-violet rays differ from X-rays in that they

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Cannot be diffracted

Cannot be polarized

Have a lower frequency

Are deviated when they pass through a magnetic field

The valence band of an atom in a solid

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is always empty

may or may not be empty

can never be empty

none of them

Which type of wave can be set up in solids

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longitudinal waves

transverse waves

both of them

none of them

magnetic field is a:

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Vector quantity

Scalar quantity

Scalar as well as scalar quantity

Any of (A) or (B)

Neither (A) nor (B)

In the above figures, tell which set is graphs shows that a body is moving uniform velocity:

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(i) and (ii)

(ii) and (iii)

(i) and (iii)

(ii) and (iv)

Absolute motion cannot be detected

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in its own frame of references

in a different frame of references

both in its frame and different frame of references

none of these

The resistance offered by a fluid to a solid moving inside it is called:

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Drag force

Surface force

Viscosity

None of these

Unit of impulse in

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Newton

Kg m

Kg m/s

Joule

While deriving equation of pressure by kinetic theory of gases, we take into account:

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Only linear motion of molecules

Only rotational motion

Only vibratory motion

All of these

The unit of thermodynamical scale is

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centigrade

fahrenheit

kelvin

none of them

Gauss(G) is smaller unit of magnetic induction which is related to tesla(T) as

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IT = 10^-4G

IT = 10⁵G

IT = 10³G

IT = 10⁴G

A capacitor acts as an infinite resistance for

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AC

DC

Both AC and DC

Neither AC nor DC

The unit of induced emf is:

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Volt

Nm/As

Joule coul^-1

Both A and C

All of these

The unit of resistivity is

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ohm

ohm-m²

ohm-meter

ohm-m^-1

A man sitting in a bus travelling in a direction from west to east with a speed of 40 km/h observes that the rain drops are falling vertically down. To the another man standing on ground the rain will appear

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To fall vertically down

To fall at an angle going from west to east

To fall at an angle going from east to west

The information given is insufficient to decide the direction of rain

When a constant potential difference is applied across the conductor, the drift velocity of electrons:

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Increases

Decreases

Remains the constant

Either of these

None of these

The energy of a photon is represented by

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h/c²

h/T

hc²

hf/c²

The nuclei of an element having the same charge number but different mass numbers are called:

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Isobars

Isotopes

Isomers

Isobaric

Isothermal

The magnetic field in the middle of a solenoid due to current is

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weak

strong and uniform

none-uniform

zero

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

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