Question # 1

Good absorbers of heat are

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Poor emitters

Non emitters

Good emitters

Highly polarized

Instead of moving the coil towards a magnet, the magnet is moved towards the coil with the same speed. The galvanometer shows current:

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Of same magnitude in the same direction

Of different magnitude in the same direction

Of same magnitude but in opposite direction

Of different magnitude in the opposite direction

None of these

The unit of flux density is also given by

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Weber/m²or Wb . m^-2

Weber/mor Wb . m

Weber/mor Wb . m^-1

Weber or Wb

An LED emits light when it is:

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Forward biased

Reverse biased

Operated without battery

Operated with heat source

None of these

The work done moving a body between two points in a conservation field is independent of the:

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Direction

Force applied

Path followed by the body `

Power

If m is the mass of the gases ejected per second with velocity v relative to the rocket of mass M, then the acceleration of rocket is

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a = M/mv

a = mM/v

a = mv/M

a = v/mm

Work done is maximum when angle between force and displacement is

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0°

90°

180°

None of these

The direction of the linear momentum is the direction of

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speed

velocity

weight

none of them

If the length of a simple pendulum is 0.25 m its time period would be

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1.0 s

2.0 s

3.0 s

4.0 s

Balmer series lies in that region of electromagnetic wave spectrum which is called:

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Visible region

Invisible region

Infra-red region

ultraviolet region

None of these

An electron of the hydrogen atom in the second orbit is called its:

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Ground state

Excited state

Ionized state

Any of these

None of these

The time rate of change of velocity is called

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Initial velocity

Uniform velocity

Accelerations

None of these

At 0k whihc of the following properties of a gas wiil be zero?

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Kinetic energy

Potential Energy

Vibrational Energy

Density

When we consider the average velocity of a body, then the body is moving in

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straight line

curved line

may be in a straight or curved path

none of them

Gravity performs zero work when body moves

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Vertically

Horizontally

At angle 60° with vertical

At angel 60° with horizontal

A copper ball of radius r is moving with a uniform velocity v in the oil. The dragging force acting on the ball is F. The dragging force on the copper ball of radius 2r moving with uniform velocity 2v in the oil is

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F

2F

4F

8F

The fundamental frequency in a stretched string is 10 Hz. To double the frequency, the tension in it must be changed to:

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T₂ = 2T₁

T₂ = 4T₁

T₂ = T₁

none of these

The magnitude of work is

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W = Fd cos θ

W = Fd

W = dF cos θ

All of these

If velocity of particle at different points does not change with time, flow is

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Streamline

Laminar

Steady

All of these

A motorist travels A to B at a speed at 40 km/h and returns at speed of 60 km/h.His average speed will be.

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40 km/h

48 km/h

50 km/h

60 km/h

While viewing a distant object with a telescope suddenly a housefly sits on objective lens.The correct statement is that

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Housefly will be seen enlarged in image

Housefly will be seen reduced in image

Intensity of image will be decreased

Intensity of image will be increased

The direction of the angular velocity vector is along

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The tangent to the circular path

The inward radius

The outward radius

The axis of rotation

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