Question # 1

Hooks law hols within

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Proportional limit

Elastic limit

Plastic limit

None

When a shell explodes in mid-air, its fragments fly off in

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One direction

Opposite direction

Different direction

None of these

The ratio of volume stress/volume strain is called as

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modulus

Bulk modulus

shear modulus

Young's modulus

The wavefront formed at very large distance from the source is:

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Cylindrical

Spherical

Elliptical

Plane

X-ray diffraction has been very useful in determining structure of

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Hemoglobin

Double helix structure of DNA

Blood speed

a and b

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

Newton's laws are adequate for speeds that are

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low compared with the speed of light

equal to the speed of light

greater than the speed of light

all of them

The transmission of information by light waves may be

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An audio signal

A television signal

A computer data signals

All of them

A charge is placed at the centre of cube,the flux emitted through its one face is

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q/ε_∘

q/2ε_∘

q/6ε_∘

q/12ε_∘

Find the potential at a point, where a charge of 1 × 10^-3 coulomb is placed at a distance of 10 m is

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1 mV

1.9 KV

1.6 KV

.15 KV

On a diffraction grating a large number of close parallel equidistant slits are ruled on it

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By hand

electronically

mechanically

none of them

The communication with any place on the surface of the Earth can be made by the wave/rays known as

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Infrared

Microwave

X-rays

Radio waves

Velocity time graph can also be used to determine

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Distance

Velocity

Acceleration

None of these

1 torr = --------------------

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1.20 Nm^-2

1.38 Nm^-2

1.33 Nm^-2

1.31 Nm^-2

In photoelectric effect, if we increase the frequency of the incident light then of the electrons increased

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Number

K.E

P.E

Frequency

Refractive index of material depends upon

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Nature of material

Wave length

Temperature

All of these

If the potential difference across the two plates of a capacitor is double, then its energy stored in will be

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2 times

5 times

4 times

Remains the same

Modulus elasticity of any materiel is of the order of:

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10⁵

10²

10^-2

10^-5

10^-10

Molecules of a solid possess:

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Translation motion

Vibration motion

Rotation motion

Linear motion

Which of the following is not true for a crystalline substance

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Shorter range order

Isotropic electrical conductivity

Flat surface

Sharp melting point

Radian is the unit of

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Solid Angle

Plane Angle

both a and b

None of these

The specific resistance of a wire varies with its:

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Length

Cross-section

Mass

Material

Between layers of liquid in relative motion, viscosity introduces

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Tangential forces

Radial forces

Intermolecular forces

Cohesive forces

1^st superconductor was discovered in year

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1890

1930

1895

1911

Bulk modulus for lead is

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2.9

7.7

9.3

15.6

Surface area is

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Scalar

Vector

Neither scalar nor vector

Both scalar and vector

Polymers are the physical combinations of carbon with:

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Oxygen only

Hydrogen

Nitrogen

All of these

None of these

If two non zero vectors A and B obey the relation |A + B| = |A - B|.then the angle between them is:

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120°

90°

60°

0°

Due to emission of 𝖰+ − 𝒓𝒂𝒚𝒔:

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Mass of the nucleus increases

Mass of the nucleus decreases

Charge on the nucleus increases

Charge number decreases

In a half wave rectifier circuit operating from 50 Hz mains frequency, the fundamental frequency in the ripple would be:

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25 Hz

70.7 Hz

50 Hz

100 Hz

When a gas is compressed:

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Its internal energy decreases

Its temperature decreases

Its temperature increases

None of these

Radian and Steradian are ________ units.

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Base

Derive

Supplementary

None of these

The maintaining the elastic limits of any body, the relation stress to strains is called

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Hooke's law

Pascal's law

Young's law

None of them

The magnifying power of a compound microscope can be increased if we use objective lens of

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Large focal length

Small focal length

Same focal length

None of these

One coulomb of charge is created by

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10 electrons

1.6 x 10^-19 electrons

6.25 x 10¹⁸ electrons

6.25 x 10²¹ electrons

Alexander graham bell transmits a voice message via a

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Beam of light

Telescope

Compound microscope

Mirror

A single step index fibre can carry more than

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14 TV channels

14,000 phone calls

16 TV channels

a and b

The path difference and phase difference are related to each other as

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Phase difference = (2π) x path difference

Phase difference = (2π/λ) x path difference

Phase difference = (λ/2) x path difference

Phase difference = (2λ/π) x path difference

Surface tension of water is reduced by adding

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Detergents

Camphor

Plastic

Both A and B

A new type of optical fibre in which central core has high refractive index and its density gradually decreases towards its periphery is called

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Step index fibre

Multimode step index fibre

Multimode graded index

None of these

The siemens is the SI unit of

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Resistance

Specific Resistance

Conductance

Inductance

The most accurate measurement out of the following is

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2 cm

2.0 cm

2.00 cm

2.000 cm

When a dielectric material is introduced between the plates of a charged condenser the electric field between the plates

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Decreases

Increases

No change

May increase or decrease