Question # 1

An amount of water of mass 20 g at 0°C is mixed with 40 g of water at 10°C. Final temperature of mixture is

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-20°C

6.67°C

5°C

0°C

A device used to measure the speed of liquid flow is known as

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barometer

speedometer

sphygmomanometer

venture-meter

The emission of radiations take place in elements, having charge number greater than

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109

82

69

52

The direction of lines of force depends upon the direction of

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voltage

current

charges

none of these

When a vector is multiplied by a negative number, its direction:

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Remains the same

Changes

Changes by 180°

None of these

When a force of 0.5 N displaces a body through a distance of 2m in the direction of force, the work done is:

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0.5 J

2 J

0.25 J

1 J

Density is defined as:

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Mass per volume

Volume per mass

Mass x volume

Mass per length

Electromagnetic radiation or photons interact with matter in

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two distinct ways

three distinct ways

four distinct ways

five distinct ways

Terminal velocity is the maximum velocity attained by a spherical droplet when the drag force______the weight of droplet:

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Is smaller than

Is greater than

Becomes equal to

None of these

Associated with the motion of a driven harmonic oscillator, there is a very striking phenomenon, know as

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waves

beat

interference

resonance

The concept of entropy was introduced into the study of thermodynamics in

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1856

1865

1656

1685

J.J Thomson finds:

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Particle nature of the electron

Dual nature of electron

Wave nature of electron

Electromagnetic nature of electron

In YDS experiment, if the distance between the slits and also the distance between slits and screen is doubled, the fringe width:

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Becomes doubled

Becomes 4 times

Is halved

Remains the same

The largest satellite system in managed by countries

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112

140

126

107

Dot product of two mutual perpendicular vector is:

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0

1

∞

None of these

In uniform circular motion the angular acceleration vector is

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Constant in magnitude and direction both

Constant in magnitude only

Constant in direction only

Varies in magnitude and direction both

𝑎, 𝖰 𝒂𝒏𝒅 radiations come out of radioactive substance:

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Spontaneously

When it is put in a reactor

When it is heated

Under pressure

By calculating the area under the velocity time graph, we can find the

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Acceleration

Velocity

Distance

None of these

Reverse process of vector addition is called

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Negative of a vector

Subtraction of vector

Resolution of a vector

Multiplication of a vector

In YDS experiment, condition for constructive interference is that path difference is equal to

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nλ

mλ

(n + 1/2)λ

(m + 1/2)λ

Relativistic mechanics was developed by

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Davison and Germer

Heisenberg

Max Planck

Albert Einstein

The projectile attains maximum horizontal range when it is projected at an angle of

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30°

45°

60°

75°

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