Question # 1

transverse wave motion is possible in:

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Air

A mixture of NH₃and O₂

Strings

All of these

When a body is performing S.H.M., its acceleration is

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inversely proportional to the displacement

directly proportional to the applied force

directly proportional to the amplitude

directly proportional to the displacement but in opposite direction

Work done is maximum when angle between force and displacement is

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0°

90°

180°

None of these

The bonding between the semi-conductor materials is

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covalent

ionic

either of them

none of them

The branch of physics which deals with the structure and properties of solids is called:

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Plasma physics

Solid state physics

Any of above

Astrophysics

Which one of the following is an example of SHM

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Motion in a plane

Motion in a swing

Motion in a car

None of these

For the normal operation of the transistor, its

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emitter-base and collector base junctions are forward biased

emitter-base junction is reversed biased and collector base junction is forward biased

emitter-base junction is forward biased and collector-base junction is reverse biased

any one of these

The kinetic energy of one molecule of a gas at normal temperature and pressure will be (k = 8.31 J/mole K) :

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1.7 x 10³J

10.2 x 10³J

3..4 x 10³J

6.8 x 10³J

Centripetal acceleration is also called ______ acceleration:

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Tangential

Radial

Angular

None of them

The electric lines of force are

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Imaginary

Physically existing everywhere

Physically existing near the charge

All of the above

The average value of current and voltage over a cycle is

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Positive

Negative

Zero

May be positive or negative

A circular scale is attached and graduated in

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One degree

2 degrees

Half degree

None of these

If focal length of objective is increased

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Magnifying power of compound microscope decreased

Magnifying power of astronomical telescope increases

The diameter of the objective lens

None of these

A radioactive nucleus can emit:

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Electron

𝛼 particles

Positron

Any of these

Volume of metal cylinder with the help of a vernier callipers of least count 0.01 cm when diameter is 1.22 cm and length 5.35 cm. Find its uncertainty as

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6.02 ± 0.1 cm³

6.2 ± 0.1 cm³

6.25 ± 0.1 cm²

6.3 ± 0.1 cm³

The amount of work done in bringing a unit positive charge from infinity to a point is called

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Potential

Potential difference

Absolute potential

None of these

Which of the following atoms cannot be detected by X-ray crystallography?

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carbon

nitrogen

hydrogen

neon

The value of 'g' at the centre of earth is

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g

zero

g/2

None of these

An orbital motion in which an artificial satellites adopts

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Circular path

Nearly circular path

Elliptic

None of these

The speed of light in vacuum is 3 x 10⁸ ms^-1.Its speed in a medium of refractive index 1.5 will be

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6.5 x 10⁸

2 x 10⁸ ms^-1

4.5 x 10⁸ cm

5.5 x 10⁸

Gauss s law in electrostatics is true when the charges enclosed in Gaussian surface are

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Stationary only

Moving only

Moving or stationary

None of these

The magnitude of vector A,B and C are respectively 12,5 and 13 units and A + B = C then the angle between A and B is

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0

π

π/2

π/4

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