Question # 1

Conventionally, all the distance p, q, f are measured from _____ of the lens:

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Focus

Optical center

Edges

None of these

A semi-conductor in its extremely pure form is known as

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extrinsic semi-conductor

intrinsic semi-conductor

either of them

none of them

The highest value reached by the voltage or current:

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In quarter cycle is called Instantaneous value

In half cycle is called peak-to-peak value

In one cycle is called peak value

In half cycle is called Instantaneous value

None of these

When a body moves along a circular path with constant speed, it has an acceleration, which is always directed

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Along the tangent

Towards the centre

Away from the centre

None of them

The weight 'mg' of the bob is resolved into

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one component

two components

three components

four components

Structure of the nucleus was explained by

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J.J Thomson

Bohr

Millikan

Rutherford

Which of the following can become a good temporarily magnet

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iron

steel

both of them

none of them

If a nucleus emits an alpha particle, its mass number decreases by 4 while charge number decreased by

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-4

4

2

1

In case of a parallel plate capacitor if the plate separation is doubled and plate area is halved, the capacitance becomes

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Four-fold

One-half

One-fourth

Zero

The most common source of alternating voltage is:

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Motor

Transformer

AC genrator

Both (A) and (C)

Both (A) and (B)

To observe interference of light, the condition, which must be met with is that the sources must be:

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Monochromatic

Phase coherent

Both of above

None of above

Which of the following is true?

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Neither momentum nor kinetic energy is conserved in inelastic collisions

Momentum is conserved in all collisions only in inelastic collisions

Momentum is conserved in all collisions but not kinetic energy

Both momentum and kinetic energy are conserved in all collisions

The moment of linear momentum is called

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Impulse

Torque

Angular momentum

Couple

A capacitor is a perfect insulator for electric

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Direct current

Alternating current

Charge

None of these

According to the first condition of equilibrium, vector sum of all the forces action on the body must be

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maximum

minimum

zero

none of them

Which type of fibre is used to send the signals of long distances?

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single mode step index fibre

multimode step index fibre

multimode graded index fibre

all of them

Amorphous solids are called

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Polymeric

Crystal

Glassy solids

All

A tank containing water has an orifice in one vertical side. If the centre of the orifice is 10 m below the surface level in tank, then velocity of efflux is

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44 ms^-1

14 ms^-1

10 ms^-1

49 ms^-1

The word amorphous means:

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Without any structure

With define structure

Regular arrangement of molecules

Both B and C

None of these

If r = 1.0 × 10^-4 m ρ = 1000 kgms^-3 η = 19 × 10^-6 kgm^-1 s^-1 find V_t terminal velocity

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1.02 × 10^-3 ms^-1

0.12 × 10^-3 ms^-1

1.1 ms^-1

1.21 ms^-1

The unit of work function is

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eV

Volt

Farad

Herdz

A pair of forces equal in magnitude and opposite in direction with non-coincident lines of action is known as

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A couple

A moment of force

A null vector

All of these

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