Question # 1

The value of threshold frequency for different metals is

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different

same

may be different or may be same

none of these

The example of irreversible process is

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slowly liquification

slowly evaporation

an explosion

all of them

Strictly speaking, the earth is:

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An accelerated frame of reference

A non-inertial frame of reference

An inertial frame of reference

^{A non-accelerated frame of reference}

Both (A) and (B)

We can excite an atom by

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Bombardment of particles

Radiating photons

Providing potential difference

All answer are true

An intertial frame of reference is a frame of reference which is

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at rest

moving with uniform velocity

either at rest or moving with uniform velocity

none of these

When the velocity of a liquid flowing steadily in a tube increases, its pressure?

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Decreases

Increases

Remains same

Zero

The direction of the acceleration is the same as that of

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speed

velocity

both of them

none of them

Under the elastic region, the deformation produced in the material, the deformation produced in the material will be

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permanent

temporary

either of them

none of them

If the displacement of a body executing S.H.M is plotted against time, then the curve is known as

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frequency of S.H.M

period of S.H.M

wave form

none of them

Lorentz force is defined as

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q(E + V x B)

q(E x B + V)

q(E x V + B)

q(E x B)

The energy of a photon is represented by

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h/c²

h/T

hc²

hf/c²

The size of the molecules in comparison with the separation between the molecules is

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Small

Very small

Extremely small

None of these

The SI units of the intensity of light are

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Lux

candela

Pois

None of these

Equal charges are given to two spheres of different radii The potential will

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Be more on the smaller sphere

Be more on the bigger sphere

Be equal on both sphere

Depend on the nature of material of sphere

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

When θ = 0 in relation d sinθ = λ, the path difference between the rays coming out from the slits of the grating will be zero. So the image in this directions is

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Dark

Bright

Non image formed

None of these

The mass of the object is a quantitative measure of its

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speed

velocity

acceleration

Inertia

Sky seems blue due to

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Diffraction

Polarization

Dispersion

Scattering

When small number of atoms from some other suitable element is added to the semi-conductor material, then this process is known as

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impurification

adding

doping

extrinsivity

For a circular orbit, the satellite has speed of

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20,000 kmh^-1

25,000 kmh^-1

26,000 kmh^-1

27,000 kmh^-1

The speed of light in other material is always

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Greater than c

Less than c

Equal to c

None of these

Gravity performs zero work when body moves

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Vertically

Horizontally

At angle 60° with vertical

At angel 60° with horizontal

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