Question # 1

'K' is the proportionality constant of force experienced by conductor. What is the value of 'K' in SI units?

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0

1

0.5

-1

If the ends of a wire are connected to a battery an electric field E will be set up at:

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The ends of the wire only

Mid points of the wire only

Every point within the wire

At nodes only

Both (B) and (D)

There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as

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maximum frequency

minimum frequency

threshold frequency

all of these

According to Huygen's principle

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light travels in straight line

Light is a transvers wave

Light has dual nature

All points on the primary wave-front are the sources of secondary wavelets

If the focal length of the convex lens is 5 cm, then to get the real and inverted image of the same size as that of object, the object should be placed at:

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5 cm

10 cm

15 cm

20 cm

There is no way to detect:

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Absolute uniform motion

Accelerated motion

State rest

State of motion

None of these

If v is the velocity of flow of liquid through a tube of area of cross-section A, then according to equation of continuity

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v/A = constant

A/v = constant

Av = constant

None

The process in which energy is dissipated from the oscillating system is known as

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resonance

interference

diffraction

damping

Area under the force displacement graph gives

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Power

Work

Heat

Energy

In case of planets, the necessary acceleration is provided by:

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Gravitational force

Coulomb force

Frictional force

None of these

Spectrum represents the number of component colours present in certain light in terms of:

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Wavelength

Frequency

Energy

Both (A) and (B)

All of these

In the formulaα_amino= 1.22λ/D, D denotes

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Distance between source and the object

Diameter of lens

Power of the lens in Diopters

None of these

A ray of light reflected from a dense medium under goes a phase change of:

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30°

60°

90°

180°

The atoms molecules or ions in a crystalline solids are at room temperature

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Motionless

Vibrate violently

Fixed

Simply vibrate

In the assessment of total uncertainties when power factor is involved, the percentage uncertainty is

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Added

Multiplied by that power

Divided by that power

None of these

For destructive interference the path difference is give by:

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(m-1/2)λ

(m+1/2)λ

mλ

1/2 mλ

The speed of a falcon in a dive is

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23 ms^-1

37 ms^-1

40 ms^-1

43 ms^-1

A book is lying on the table What is the angle between the action of the book and the reaction of the table on the book

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0°

180°

30°

90°

High temperature superconductors have temperature

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Above 77 K

Below 77 K

At 77 K

None of these

A steel bar can bear a load of 20 tons. If the thickness of bar is double, then for the same depression it can bear a load of:

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40 ton

80 ton

160 ton

5 ton

The motion without consideration of its cause is studied in:

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Kinematics

Mechanics

Statics

Modern Physics

In a uniform circular motion of a particle, the direction changes but not its

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Angular displacement

Magnitude of velocity

Force towards centre

b and c

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