Physical World Test

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Physical World Test - 17

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Weekly Quiz Competition

Question 1
1 / -0

The output of a given windmill

A
Increases with an increase in wind velocity

B
Decreases with an increase in wind velocity

C
Is independent of wind velocity

D
Cannot be determined

Solution

$$\begin{array}{l} \text { The output of a given wind mill depends on turbine } \\\text { size and the Wind's speed through the rotor. } \\\text { Greater the Wind velocity greater the output. }\end{array} $$
Question 2
1 / -0

Among the following liquids, the pressure inside them at a given depth is the highest in ______ at a constant temperature.

A
fresh water

B
petrol

C
sea water

D
alcohol

Solution

$$\begin{array}{l}\text { Density of sea water is more so the pressure inside } \\\text { them at a given depth is highest in sea water. }\end{array}$$
Question 3
1 / -0

Which of the following is used to punch holes in thick metallic block?

A
Drilling machine

B
Hydraulic press

C
Hammer and anvil

D
All the above

Solution
Question 4
1 / -0

Which of the following instruments is used to check whether electricity is flowing through a substance or not?

A
Ammeter

B
Voltmeter

C
Tester

D
None of these

Solution

Tester is used to check whether electricity is flowing through a substance or not.
Question 5
1 / -0

In a microwave oven the device used for generating microwaves is

A
Stirrer fan

B
Metal wall

C
Magnetron

D
Cyclotron

Solution

$$\begin{array}{l}\text { Magnetron is a highly powered vaccum tube that gene- } \\\text { -rates microwaves using the interaction of a stream } \\\text { of electrons with a magnetic field. } \\\text { simply magnetron is used for generating micro waves. }\end{array}$$
Question 6
1 / -0

Which of the following is/are the source/s of ultraviolet radiations?

A
The sun

B
Electric arcs of mercury

C
Discharges in hydrogen

D
All of these

Solution

$$\begin{array}{l}\text { Natural source of UV radiation is Sun. } \\\text { Where as artificial Sources are Black (lights, short wave }\end{array}$$
$$\begin{array}{l}\text { UV lamps, Electric arc's, gas discharges, uv lasers, } \\\text { UV LEDS etc. }\end{array}$$
Question 7
1 / -0

A flat-bottomed test-tube with some lead shots in it floats upto a depth of 3.2 cm in a liquid and 2.4 cm in water. Find the relative density of the liquid.

A
0.24

B
0.75

C
0.1

D
0.5

Solution

$$\begin{array}{l}\text { Mass of liq displaced = Volume displaced} \times \text{density of liquid } \\\text { mass of water displaced = } A \times 2.4 \times d_{1} \\\text { Mass of (liquid displaced }=A \times 3.2 \times d_{2}\end{array} $$

$$\begin{array}{l}\text { mass of water and liquid displaced are equal } \\\qquad A\times 2 \cdot \varphi d_{1}=A \times 3\cdot 2 d_{2}\end{array}$$

$$\begin{array}{l}\quad \dfrac{d_{2}}{d_{1}}=\dfrac{2.4}{3.2}=0.75 \\\text { Relative densety of }\text { liquid }=0.75\end{array}$$
Question 8
1 / -0

The light from the sun takes $$400$$ s to reach the earth. Assuming that the speed of the light is $$2,00,000 km/s$$, calculate the distance between the sun and the earth-

A
$$800$$ million km

B
$$80$$ million km

C
$$100$$ million km

D
$$120$$ million km

Solution

Given data:
Time taken by light to reach at earth $$=400s$$
speed of light $$=200000km/s$$
To find distance between sun and earth $$=?$$
$$Distance= speed\times time$$
$$=200000\times 400$$
$$=80\times 10^6Km$$
$$=80 \ million \ km$$
Question 9
1 / -0

Which of the following is a contact force ?

A
Gravitational force

B
Friction

C
Electrostatic force

D
Magnetic force

Solution

Frictional forces arise when two bodies come in contact with each other (b).
Question 10
1 / -0

A charged comb picks up bits of paper because of :

A
magnetic force

B
gravitational force

C
contact force

D
electrostatic force

Solution

A charged comb attracts the electrons in the bits of paper through electrostatic force.(d)

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Re-Attempt Weekly Quiz Competition

Physical World Test - 17

Result

Physical World Test - 17

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SHARING IS CARING

Question 1

Increases with an increase in wind velocity

Decreases with an increase in wind velocity

Is independent of wind velocity

Cannot be determined

Solution

Question 2

fresh water

petrol

sea water

alcohol

Solution

Question 3

Drilling machine

Hydraulic press

Hammer and anvil

All the above

Solution

Question 4

Ammeter

Voltmeter

Tester

None of these

Solution

Question 5

Stirrer fan

Metal wall

Magnetron

Cyclotron

Solution

Question 6

The sun

Electric arcs of mercury

Discharges in hydrogen

All of these

Solution

Question 7

0.24

0.75

0.1

0.5

Solution

Question 8

$$800$$ million km

$$80$$ million km

$$100$$ million km

$$120$$ million km

Solution

Question 9

Gravitational force

Friction

Electrostatic force

Magnetic force

Solution

Question 10

magnetic force

gravitational force

contact force

electrostatic force

Solution

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