Question # 1

SI unit of current describes the flow of charge at the rate of

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One ampere per second

One coulomb per second

One electron per second

6.25 x 10¹⁸electrons per second

Both B and D

The term drift velocity is used when the ends of a wire are:

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Connected to a laser source

Connected to a voltage source

Not connected to a voltage source

At different values of potential

Both (B) and (D)

When some compass needles are placed on a card board along a circle with the center at the wire, they will

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Point the direction of N-S

Set themselves tangential to the circle

Point in the direction of E-W

None of these

Point in direction of S-E

In magnet-coil experiment, emf can be produced by:

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Keeping the coil stationary and moving the magnet

Keeping the magnet stationary and moving the coil

Relative motion of the loop and magnet

Any one of above

All above

The solids which has structure in-between order and disorder are called

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amorphous solids

polymeric solids

crystalline solids

all of them

An electron is accelerated through a potential difference of 50v. its de-Brogile wavelength is

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1.66 x 10^-29m

1.74 x 10^-10cm

17.4 x 10^-6m

1.74 x 10^-10m

Neutron was suggested to be in the nucleus by:

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Rutherford in 1920

Bohar in 1913

Dirac in 1928

Anderson in 1932

None of these

Internal friction of fluid is called

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Surface tension

Viscosity

Resistance

Cohesive force

If the object is situated at focus of a convex lens, then its image is formed at:

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F

2F

Infinity

None of these

The unit of thermodynamical scale is

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centigrade

fahrenheit

kelvin

none of them

For transmission of both transverse and longitudinal waves, we can use:

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Solid

Gas

Plasma

None of these

An object thrown upward with an initial velocity at certain angle with the horizontal and moving freely under the action of gravity is called

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a rocket

an aeroplane

a projectile

a balloon

Which property of waves proves that light is a transverse wave?

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diffraction

interference

polarization

reflection

Single mode step index fibre has

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Thick core and large cladding

Thick core and shorter cladding

Thin core and shorter cladding

Thin core and larger cladding

The perpendicular distance form the line of action of force to the pivot point is called

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couple arm

angular distance

moment arm

none of them

The distance to the nearest galaxy is

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10²⁰ m

10²⁹ m

10³⁰ m

10³¹ m

Which of the Following bulb will glow Brightest?

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100W

200W

300W

400W

For total internal reflection to take place, the angle of incidence must be ______ than critical angle and the light should travel from ______ to ______ medium

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Greater, rarer, denser

Smaller, rarer, denser

Smaller, denser, rarer

Greater, denser, rarer

The excess (equal in number) of electrons that must be placed on each of two small spheres spaced 3 cm apart,with force of repulsion between the spheres to be 10^-19 N,is

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25

225

625

1250

At the point of contact of the lens and the glass plate, the Newton's ring is

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dark

bright

either of them

neither of them

Viscosity of water at 30^oC in Nsm^-2

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0.521 × 10^-3

0.564 × 10^-3

0.594 × 10^-3

0.599 × 10^-3

At terminal velocity the net force acting on it is

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Maximum

Minimum

Zero

None of these

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