Question # 1

The measure of the deformation in a solid when stress is applied to its is called

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elastic constant

young's modulus

strain

elasticity

The principle characteristics of an ideal standard are

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Inaccessible and Invariable

Accessible and Invariable

Accessible and Variable

None of these

Particles have the mass smallest of following is:

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Electron

Proton

Neutron

Quark

When a platinum wire is heated, it appears dull red at about

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500°C

900°C

1100°C

1300°C

A tube is tapered from 20 cm diameter to 2 cm diameter, the velocity at the first cross-section is 50 cm/s, then the velocity at the second cross-section is

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50 m/s

20 m/s

40 cm/s

5 cm/s

A point charge A of charge +4μC and another B of charge -1μC are placed in air at a distance 1 m apart. Then the distance of the point on the line joining the charge B, where the resultant electric field is zero, is (in m)

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2

1

0.5

1.5

The existence of position was predicted by Dirace in

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1920

1925

1930

1928

In SHM, there is always a constant ratio between displacement if body and its:

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Velocity

Period

Mass

Acceleration

When a large number of atoms are brought close to one another to form a solid, each energy level of an isolated atom splits into sub-levels, called

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energy bands

energy shells

states

all of them

The instrument which detects the instant at which external pressure becomes equal to the systolic pressure is

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stethoscope

thermometer

manometer

barometer

A dimension stands for the ___________ nature of certain physical quantity.

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super

Quantitative

Qualitative

Both B and C

In Michelsons interference the movable mirror is moved and a shift of two fringes is observed then the distance moved by the mirror is

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λ/2

λ

2λ

None

Huygen's wave theory of light cannot explain

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Diffraction

Interference

Polarization

Photoelectric effect

Wavelength of light of frequency 100 Hz is

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2 x 10⁶m

3 x 10⁶m

4 x 10⁶m

5 x 10⁶m

Polarization of material in an electric field is a

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Permanent phenomenon

Purely a temporarily phenomenon

Time dependent phenomemon

None of these

The escape velocity of Mars in Kms^-1

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2.89

3.99

5.00

5.23

Base quantities are those which

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Remain the same

Can be derived

Further divided

None of these

The equation PVr = Constant applies to:

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Isothermal process

Adiabatic process

Isobaric process

None of these

Length of a metal cylinder with the help of a vernier callipers of least count 0.01 cm is 5.35 cm. Its percentage uncertainty in length is

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2%

2.3%

0.2%

0.3 %

A train us moving with a velocity of 25 m/s and a car is moving behind it by a velocity of 8 m/s in same direction The relative velocity of train with respect to car is

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17 m/s

33 m/s

17.5 m/s

None

When the shear stress and shear strain are involved, then their ratio is called

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Young's modulus

Bulk modulus

Shear modulus

all of them

The stress which increase the length in one dimension only is called

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length stress

only have compressive stress

Have both tensile and compression stress

None of them

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