Physical World Test

Result

Physical World Test - 15

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following class of forces is different from others?

A
Magnetic force

B
Electrical force

C
Gravitational force

D
Stretching of a spring

Solution

Spring force is different from magnetic ,electrical and gravitational force as it varies linearly.
Question 2
1 / -0

Lamps used for street lighting are connected in

A
Parallel

B
Series and Parallel both

C
Series

D
None of the above

Solution

Lamps used for street lighting are connected in parallel because all the lamps have same voltage.
Question 3
1 / -0

Oil rises up the wick in a lamp because

A
Oil is volatile

B
Oil is very light

C
Of the surface tension phenomenon

D
Of the diffusion of oil through the wick

Solution

$$\begin{array}{l}\text { since wick has cappliary's by the help of surface tension } \\\text { of rises up the wick. }\end{array}$$
Question 4
1 / -0

Challenger is the name of a

A
Space-lab

B
Space shuttle

C
Satellite

D
Rocket

Solution

Challenger is the name of a Space shuttle.
Question 5
1 / -0

A glass tumbler containing ice shows droplets of water on the outer surface because

A
The outer surface of the tumbler shows hygroscopic effect

B
Water from inside oozes out through the wall of the tumbler

C
The moisture in the air on coming in contact with the cold surface of the tumbler condenses in the form of droplets of water

D
(A) and (B)

Solution

The water vapour present in the air, on coming in contact with the cold glass of water, loses energy and gets converted to a liquid state (gets condensed), which can be seen as tiny water droplets.
Question 6
1 / -0

To a space traveler on the moon during day time the lunar sky appers

A
Blue

B
Black

C
White

D
Red

E
Yellow

Solution

$$\begin{array}{l}\text { The moon's atmosphere is negligibly thin essentially } \\\text { vaccum, so its sky is always black. However sun is so }\end{array}$$
$$\text { bright that it is impossible to see stars during daytime. }$$
Question 7
1 / -0

On a rainy day

A
Dry and wet thermometer's give identical readings

B
Wet thermometer reads more than dry thermometer

C
Wet thermometer reads slightly less than the dry thermometer

D
Wet thermometer reads much less than the dry thermometer

Solution
Question 8
1 / -0

Lightning is observed earlier than the sound is heard because

A
Light travels faster than sound

B
Thunder is produced later

C
Thunder is produced simultaneously but it travels after light has reached the observer's eyes

D
Man's sense of vision is sharper than his sense of hearing

E
None of the above

Solution

Velocity of light is very small in compere to the velocity of Sound. Therefore Lightning is observed earlier than the sound is heard.
Question 9
1 / -0

Railway tracks are banked on curves so that

A
No frictional force may be produced between the track and the wheels

B
The train may not fall down inwards

C
The weight of the train may be reduced

D
Necessary centrifugal force may be obtained from the horizontal component of the weight of the train

Solution

$$\begin{array}{l}\text { When a fast moving train takes a curved path, it tends } \\\text { to move away tangentially off the track. In order to } \\\text { prevent this, the curved tracks are banked on the } \\\text { out side to produce the necessary centripetal force required } \\\text { te keep train moving in a curved path }\end{array}$$
Question 10
1 / -0

The function of cement in masonry is based on the phenomenon of

A
Adhesion

B
Cohesion

C
Rigidity

D
Elasticity

E
Flexibility

Solution

$$\begin{array}{l}\text { The function of cement in masonry is based on the } \\\text { phenomenon of Adhesion i.e able to stick fast to a } \\\text { surface or an object. }\end{array}$$

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Re-Attempt Weekly Quiz Competition

Physical World Test - 15

Result

Physical World Test - 15

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SHARING IS CARING

Question 1

Magnetic force

Electrical force

Gravitational force

Stretching of a spring

Solution

Question 2

Parallel

Series and Parallel both

Series

None of the above

Solution

Question 3

Oil is volatile

Oil is very light

Of the surface tension phenomenon

Of the diffusion of oil through the wick

Solution

Question 4

Space-lab

Space shuttle

Satellite

Rocket

Solution

Question 5

The outer surface of the tumbler shows hygroscopic effect

Water from inside oozes out through the wall of the tumbler

The moisture in the air on coming in contact with the cold surface of the tumbler condenses in the form of droplets of water

(A) and (B)

Solution

Question 6

Blue

Black

White

Red

Yellow

Solution

Question 7

Dry and wet thermometer's give identical readings

Wet thermometer reads more than dry thermometer

Wet thermometer reads slightly less than the dry thermometer

Wet thermometer reads much less than the dry thermometer

Solution

Question 8

Light travels faster than sound

Thunder is produced later

Thunder is produced simultaneously but it travels after light has reached the observer's eyes

Man's sense of vision is sharper than his sense of hearing

None of the above

Solution

Question 9

No frictional force may be produced between the track and the wheels

The train may not fall down inwards

The weight of the train may be reduced

Necessary centrifugal force may be obtained from the horizontal component of the weight of the train

Solution

Question 10

Adhesion

Cohesion

Rigidity

Elasticity

Flexibility

Solution

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