Physical World Test

Result

Physical World Test - 16

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Weekly Quiz Competition

Question 1
1 / -0

Sometimes the tubes in the well-inflated tyres of a cycle left in the sun burst open

A
Because the pressure of air inside the tube increases

B
Because the volume of air inside the tube increases due to rise in its temperature

C
Because the tube containing air melts

D
Because the volume and the pressure both increase

E
None of the above

Solution

Sometimes the tubes in the well-inflated tyres of a cycle left in the sun burst open Because of the volume of air inside the tube increases due to rise in its temperature.
Question 2
1 / -0

The common balance works on the principle of equality of

A
Forces

B
Moments of forces

C
Masses

D
Masses of pans

Solution

$$\begin{array}{l}\text { Common balance work's on the principle of } \\\text { forces. } \\\qquad m_{1} \times 4_{1}=m_{2} \times 12\end{array}$$
Question 3
1 / -0

The instrument connected with the recording and reproduction of sound is called

A
Gramophone

B
Headphone

C
Hydrophone

D
Ear phone

E
None of the above

Solution

Gramophone is the device that is used to record and reproduce the sound.
Thus, option (A) is correct.
Question 4
1 / -0

A red and a green pencil are taken in a room illuminated with green light. In the room

A
Both pencils will appear dark

B
Pencils will appear as red and green respectively

C
Red pencil will appear dark and green pencil as green

D
Red pencil will appear red and green pencil dark

Solution

$$\begin{array}{l}\text { A colour absorbs all other colour's except it's own. } \\\text { So red absorbs all excepted and green absorbs all except } \\\text { green. } \\\text { So when a red and a green pencil are kept in green (light. }\end{array}$$
$$\begin{array}{l}\text { the green pencil reflects green colour and red pencil absorbs } \\\text { greencolour. Therefore green pencil appears green and the } \\\text { red pencil appear's dark. }\end{array}$$
Question 5
1 / -0

What metallic wire is fused in glass?

A
Copper

B
Platinum

C
Tungsten

D
Silver

Solution

$$\begin{array}{l}\text { If the wire and glass expanded at different rates } \\\text { the seal would be broken. platinum has same } \\\text { expansion rate as of glass. Since both glass and } \\\text { Platinum move at same rate, the seal between them } \\\text { is undamaged. }\end{array}$$
Question 6
1 / -0

Light pollution is caused when

A
the ozone layer is damaged

B
too much of light sources are used unnecessarily

C
light sources pointing up to the sky rather than down to the earth

D
sources of light are polluted

Solution

$$\begin{array}{l}\text { Light pollution is presence of anthropogenic and artificial } \\\text { light in the night environment. } \\\text { misdirected use of light is also part of it} \text { . } \\\text { so light sources pointing up in sky produces light pollution. }\end{array}$$
Question 7
1 / -0

Astronomers have discovered a bizarre, hexagon-shaped feature in the clouds of Saturn near the planet's north pole. The feature was first seen in images sent by the

A
Voyager spacecraft

B
Casis spacecraft

C
Messenger spacecraft

D
Pathfinder spacecraft

Solution

$$\begin{array}{l}\text { Saturn's hexagon was discovered during the } \\\text { voyager mission in } 1981 \text { this hexagonal cloud pattern } \\\text { around northpole of saturn, located at about } 78^{\circ} \mathrm{N}\end{array}$$
Question 8
1 / -0

Sudden fall of a barometer reading indicates

A
Storm

B
Dry weather

C
Fine weather

D
Cold weather

Solution

$$\begin{array}{l}\text { Sudden fall in barometer reading indicates } \\\text { Storm. As storms have a centreof low } \\\text { pressure with a system of high pressure } \\\text { sorrounding it. Since pressure falls while } \\\text { going into storm there will be fall in } \\\text { barometer. }\end{array}$$
Question 9
1 / -0

If two substances of equal volumes but of different densities are dropped from the same height simultaneously, then

A
The body of lower density will reach the earth earlier

B
Both the bodies will reach the earth simultaneously

C
The body of higher density will reach earlier

D
It depends upon the place

Solution

$$\begin{array}{l}\text { Any two substances dropped from same height reach } \\\text { earth simultaneously as the acceleration during is } \\\text { same g for both bodies. }\end{array}$$
Question 10
1 / -0

A sharp knife cuts much better than a blunt one because

A
Area of sharp knife is much less than the area of the blunt one

B
Sharp knife is brighter

C
Sharp knife is colder

D
Sharp knife is costly

Solution

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Re-Attempt Weekly Quiz Competition

Physical World Test - 16

Result

Physical World Test - 16

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SHARING IS CARING

Question 1

Because the pressure of air inside the tube increases

Because the volume of air inside the tube increases due to rise in its temperature

Because the tube containing air melts

Because the volume and the pressure both increase

None of the above

Solution

Question 2

Forces

Moments of forces

Masses

Masses of pans

Solution

Question 3

Gramophone

Headphone

Hydrophone

Ear phone

None of the above

Solution

Question 4

Both pencils will appear dark

Pencils will appear as red and green respectively

Red pencil will appear dark and green pencil as green

Red pencil will appear red and green pencil dark

Solution

Question 5

Copper

Platinum

Tungsten

Silver

Solution

Question 6

the ozone layer is damaged

too much of light sources are used unnecessarily

light sources pointing up to the sky rather than down to the earth

sources of light are polluted

Solution

Question 7

Voyager spacecraft

Casis spacecraft

Messenger spacecraft

Pathfinder spacecraft

Solution

Question 8

Storm

Dry weather

Fine weather

Cold weather

Solution

Question 9

The body of lower density will reach the earth earlier

Both the bodies will reach the earth simultaneously

The body of higher density will reach earlier

It depends upon the place

Solution

Question 10

Area of sharp knife is much less than the area of the blunt one

Sharp knife is brighter

Sharp knife is colder

Sharp knife is costly

Solution

User

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