Physics Test

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Physics Test - 62

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Weekly Quiz Competition

Question 1
1 / -0

Resistance of human body in dry condition

A
10 ohm

B
1000 ohm

C
10000 ohm

D
100000 ohm

Solution

Under dry conditions, the resistance offered by the human body may be as high as 100,000(10^5) Ohms.
Question 2
1 / -0

What is refractive index ?

A
it is defined as the ratio of speed of light in the medium to the speed of light in vacuum.

B
it is defined as the product of speed of light in medium and in vacuum.

C
it is defined as the ratio of speed of light in vacuum to the speed of light in the medium .

D
None of above

Solution

It is defined as the ratio of speed of light in vacuum to the speed of light in the mediumis refractive index.
Question 3
1 / -0

Hot water is poured simultaneously in four metallic tumblers painted outside with different paints. After some time the water will be found to have cooled most in the tumbler painted.

A
rough white

B
rough black

C
shining white

D
shining black

Solution

Black surfaces are good emitters of heat. If the black surface is rough too, the emitting will be better. Shinning surfaces reflect black radiation . So if the black surface is also shining the effectiveness of emitting heat is lessened.
Question 4
1 / -0

Rolling friction is caused by ____ from the following?

A
Non-elastic effects

B
Gravity

C
Power dissipation

D
Buoyancy

Solution

Rolling friction or rolling drag is the force resisting the motion when a body rolls on a surface. It is mainly caused by non-elastic effects, that is, not all the energy needed for deformation of the wheel, roadbed, etc... is recovered when the pressure is removed.

Another cause of rolling resistance lies in the slippage between the wheel and the surface, which dissipates energy.
Question 5
1 / -0

When two similar sources vibrate with slightly different frequencies , a regular rise and fall occurs in the loudness of tone. This phenomenon is known as

A
doppler effect

B
beats

C
resonance

D
echo

Solution

Beats means the periodic increase and decrease in loudness heard when two notes of nearly the same frequency are sounded simultaneously.
Question 6
1 / -0

Q = mcdT refers to

A
Enthalpy formula

B
Heat Transfer formula

C
Specific Heat formula

D
Heat of Vaporization

Solution

Q = mc∆T refers to Specific Heat formula.

When heat energy is added to a substance, the temperature will change by a certain amount.

The relationship between heat energy and temperature is different for every material, and the specific heat is a value that describes how they relate.

Q = mc∆T

Q = heat energy (Joules, J)

m = mass of a substance (kg)

c = specific heat (units J/kg∙K)

∆T = change in temperature (Kelvins, K)
Question 7
1 / -0

What are the particles emitted by radio active element after 3 consequtive disintegrations?

A
2 alpha 1 beta

B
1 alpha 1 beta

C
2 beta 1 alpha

D
2 beta 2 alpha

Solution

2 beta 1 alpha are the particles emitted by radio active element after 3 consequtive disintegrations.
Question 8
1 / -0

On which day ' National Science Day ' is celebrated in India ?

A
February 23

B
February 25

C
February 26

D
February 28

Solution

National Science Day is celebrated in India on 28 February each year to mark the discovery of the Raman effect by Indian physicist Sir Chandrashekhara Venkata Raman on 28 February 1928.
Question 9
1 / -0

Solids have definite shapes.This is because

A
the forces of cohesion of the molecules within are very much less in them

B
the forces of cohesion are very large

C
the forces of adhesion are large

D
the forces of adhesion are less

Solution

Cohesion refers to attraction between molecules of the same kind while adhesion refers to attraction between different kinds of molecules.
Question 10
1 / -0

How many laws of physics are there?

A
5

B
4

C
3

D
2

Solution

Physics has 5 laws. But the 3 laws of Newton has been clubbed together under one Law. Therefore there are 3 Newtons laws of Physics. They are ::1. Newtons Laws of Motion, 2. Newtons Law of Cooling,3. Newtons Law of Gravitation.

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Re-Attempt Weekly Quiz Competition

Physics Test - 62

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Physics Test - 62

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SHARING IS CARING

Question 1

10 ohm

1000 ohm

10000 ohm

100000 ohm

Solution

Question 2

it is defined as the ratio of speed of light in the medium to the speed of light in vacuum.

it is defined as the product of speed of light in medium and in vacuum.

it is defined as the ratio of speed of light in vacuum to the speed of light in the medium .

None of above

Solution

Question 3

rough white

rough black

shining white

shining black

Solution

Question 4

Non-elastic effects

Gravity

Power dissipation

Buoyancy

Solution

Question 5

doppler effect

beats

resonance

echo

Solution

Question 6

Enthalpy formula

Heat Transfer formula

Specific Heat formula

Heat of Vaporization

Solution

Question 7

2 alpha 1 beta

1 alpha 1 beta

2 beta 1 alpha

2 beta 2 alpha

Solution

Question 8

February 23

February 25

February 26

February 28

Solution

Question 9

the forces of cohesion of the molecules within are very much less in them

the forces of cohesion are very large

the forces of adhesion are large

the forces of adhesion are less

Solution

Question 10

5

4

3

2

Solution

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