Question # 1

Work done is maximum when angle between force and displacement is:

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0°

90°

180°

None of these

Teh consumption of energy by a 1000 watt heater in half an hour is:

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5 Kwh

0.5 Kwh

2.5 Kwh

3.2 Kwh

A galvanometer is an instrument used to

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measure voltage across a circuit

detect current in a circuit

measure current flowing through a circuit

none of these

The mass of fluid passing through any cross-section per unit time is called

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electric flux

magnetic flux

mass flux

none of them

The horizontal component of a projectile moving with initial velocity of 500 ms^-1at an angle 60° to x-axis is

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500 ms^-1

1000 ms^-1

250 ms^-1

Zero

In an A.C. circuit, a resistance of R ohm is connected in series with an inductance L. If phase angle between voltage and current be 45°. the value of inductive reactance will be

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R/4

R/2

R

Cannot be found with the given data

Work done is maximum when angle between force and displacement is

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0°

90°

180°

None of these

Fluid A is more viscous than fluid B. While flowing through a pipe of the same dimensions and material which fluid takes longer to travel at 25°C?

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fluid B

fluid A

both take the same time

not possible to determine from given information

Two forces of 10 N and 8 N are applied simultaneously to a body. the maximum value of their resultant is:

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2 N

- 2 N

18 N

36 N

Velocity of a body changes if

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direction of the body changes

speed of the body changes

neither speed nor direction changes

either speed or direction changes

A diode which can turn its current ON and OFF in nono seconds is called:

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LED

Photodiode

An ordinary diode.

Both (A) and (B)

Both (B) and (C)

Thermal and mechanical equilibrium is maintained all the time so that each process is

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Reversible

Perfectly reversible

Irreversible

None of these

In a compound microscope the intermediate image is

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Virtual erect and magnified

Real,erect and magnified

Virtual,inverted and magnified

Virtual,erect and reduced

Trajectory of projectile is

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Ellipse

Hyperbola

Parabola

None of these

Newton's rings are:

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Rectangular

Spherical

Concentric circles

None of these

The wave length of x-rays is of the order of

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10^-17 m

10^-4 cm

10^-9 m

10^-10 m

The crystalline structure of NaCl is

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rectangular

hexagonal

tetrahedral

cubical

The engine of a car produces acceleration of 4 m/s²in the car.If this car pulls another car same mass,what will be the acceleration produces in m/s²

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2

8

4

12

If a particle covers half the circle of radius R with constant speed then

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Momentum change is mvr

Change in KE is 1/2 mv²

Change in KE is mv²

Change in KE is zero

With the help of interferometer, we can find the

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Wavelength

Frequency

Phase

None of these

The function of compensator plate in interferometer is to

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Interfere properly

To equalize the distance of M₁ and M₂

Reflecting light properly

None of these

Optical device used in spectrometer

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Simple microscope

Compound microscope

Telescope

Any of them

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