Question # 1

Max Planck received the Nobel Prize for his discovery of energy quants in:

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1718 AD

1918 AH

1818 AD

1918 AD

None of these

The rectangular components of a vector are equal in magnitude when the vector makes and angle _______with their x-component:

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0°

30°

45°

60°

The minimum wavelength of X-rays produced of 1KV potential difference is applied across the anode and cathode of the tube is

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1.24 x 10^-10m

7.92 x 10^-20m

2.78 x 10^-14m

3.88 x 10^-11m

The heat required to raise the temperature of one mole of the gas through 1 K at constant volume is called

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heat capacity

specific heat capacity

molar specific heat

molar specific heat at constant volume

Which of the following is a characteristic of an ideal fluid?

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it is non-viscous

it is incompressible

it's motion is steady

all of the above

Unit of viscosity is:

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Kg m^-1sec^-1

N s m^-2

J s m^-3

All of these

In his experiment on nuclear reactions, Rutherford bombardedα particles on:

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Nitrogen

Hydrogen

Lead

Oxygen

Krypton

The ratio of shearing stress/shearing strain is called as

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Modulus

Pascal modulus

Hooker's modulus

Shear modulus

A 100 kg car is moving at a speed of 10 m/sec and comes to rest after covering a distance of 50 m. the amount of work done against friction is:

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+5 x 10¹J

+5 x 10²J

+5 x 10³J

+5 x 10⁴J

when the deformation produced in the material become permanent, this type of behaviour is called

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proportionality

elasticity

plasticity

none of them

A 100 Kg car is moving at the speed of 10 m/sec and comes to rest after covering a distance of 50 m. The amount of work done against the friction is:

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+5 X 10¹J

+5 X 10²J

+5 X 10³J

+5 X 10⁴J

An are equal to radius of the circle subtended an angle of ______ at the center of circle

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1 rad

2 rad

π rad

1/2π rad

The retarding force of the stream of water on a motor boat moving with a uniform velocity of 30 ms^-1is 5000 N The power of motor boat is

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1.50 kw

15 kw

105 kw

150 kw

The distance between the objective and eye-piece of a telescope in normal adjustment is

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f/₀-f_e

f₀+f_e

2f_e-f_e

None of these

A gravity free system, in which satellite moves due to

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The free fall acceleration

Radial accelerations

Gravitational acceleration

All of these

The terminal velocity of for a water droplet of radius 10^-5 m is of the order of

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1 cm/s

1 mm/s

1 nm/s

1 μm/s

A null vector is defined as

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Zero magnitude

Arbitrary direction

Fixed direction

a and b

Which of the particles, electron, proton and neutron moving with same speed has longest wave length?

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Electron

Proton

Neutron

All have same

Age of earth is approximately

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1.4 x 10¹⁷years

5 x 10¹⁷s

1.4 x 10^-17s

1.4 x 10⁷

Wavelength of light of frequency 100 Hz is

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2 x 10⁶m

3 x 10⁶m

4 x 10⁶m

5 x 10⁶m

If the diameter and mass of the earth become two times their present values, then the weight of an object on the surface of the earth will

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Remain unchanged

Become half

Become one fourth

Be doubled

A stress which is along one dimension is known as:

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Tensile stress

Linear stress

Compressive stress

Both (A) and (C)

Both (A) and (B)

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