Question # 1

The resistance of an incandescent lamp is

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Smaller when switched on

Greater when switched off

The same whether it is switch off or switch on

Greater when switched on

The molecules or ions in a crystalline solids are

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static

not static

randomly moving

all of them

A magnifier gives an image which is:

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Virtual, inverted

Real, erect

Virtual, erect

Real, inverted

Work is a Quantity

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Vector

Scalar

Non-physical

None of these

The number of protons inside a nucleus is called

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mass number

atomic weight

atomic number

none of these

The voltage increases linearly with

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time

velocity

acceleration

torque

In case of the three dimensional deformation, when volume is involved, the ratio of applied stress to volumetric strain is called

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Young's modulus

Bulk modulus

Shear modulus

all of them

The decrease in velocity per unit time is called

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deceleration

acceleration

uniform acceleration

variable acceleration

The ratio of average e.m.f in the coil tot he time rate of change of current in the same coil is called

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Mutual induction

Mutual inductance

Capacitance

Self inductance

In flesh, light element like carbon, hydrogen and oxygen predominate. Three elements allows ______ amount of incident X-ray to pass through them

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Small

Greater

Equal

Sometimes

Which of the following phenomenon proves the particle nature of light

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interference

diffraction

photoelectric effect

none of these

The speed at which light travels within the material depends upon

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Refractive index of medium

Wavelength

Frequency

Intensity

Stress beyond which a permanent deformation is observed in a body is called

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Minimum stress

Maximum

Yield stress

Plastic stress

A fly is sitting on the objective of a telescope pointed towards the moon.What effect is expected on the photography of the moon taken through the telescope?

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The entire field of view blocked

There is an image of the fly on the photography

There is no effect at all

There is a reduction in the intensity of the image

The relative permitivity for vacuum is

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1

2

1.002

1.004

In a full wave rectifier:

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DC current is twice that of half wave rectifier

DC pulses are twice per cycle that of half wave rectifier

DC voltage is twice that of half wave rectifier

All are correct

Bulk modulus for tungsten is

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50

100

150

200

The light from the sun reaches to earth with wavefronts

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Spherical

Cylindrical

Plane

None of these

Telescope is an optical device used for viewing

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Near objects

Not far distance

Distant objects

b and c

Between layers of liquid in relative motion, viscosity introduces

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Tangential forces

Radial forces

Intermolecular forces

Cohesive forces

The speed of sound in air is

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320 ms^-1

323 ms^-1

330 ms^-1

333 ms^-1

Newton's rings are:

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Rectangular

spherical

Concetric circles

None of these

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