Let's Test Our Knowledge

Question 1

Why does big fire in the open appear to be fanned by strong winds?

Accepted Answer

It is because the surrounding heated air rises and cool air cool air rushes

Question 2

Which of the following pairs is correctly matched?

Accepted Answer

Salt petre – potassium nitrate

Question 3

Longitudinal waves cannot travel through

Accepted Answer

vacuum.

Question 4

Instrument used to measure the force and velocity of the wind

Accepted Answer

anemometer

Question 5

What is the main cause of seasons on the Earth?

Accepted Answer

The tilt of the Earth's axis in relation to the sun

Question 6

One of the essential minerals in the human body is salt. How much salt (NaCl) is in the average adult human body?

Accepted Answer

250 grams

Question 7

Oil rises up the wick in a lamp because

Accepted Answer

of the capillary action phenomenon.

Question 8

· Which of the following helps reduce food spoilage?

Accepted Answer

darkness, no air, low temperature, no moisture

Question 9

Which among the following is the strongest oxidizing agent?

Accepted Answer

O3

Question 10

Which day of the year is celebrated as mole’s day

Accepted Answer

23 october

Question 11

While catching a cricket ball, a player pulls down his hands to lower the impulse.

Accepted Answer

True

Question 12

Woolen clothes keep the body warm because

Accepted Answer

wool is a bad conductor

Question 13

You can't live without iron. Where in the body is most of the iron located?

Accepted Answer

YOUR BLOOD

Question 14

The different colours of different stars is due to the variation of

Accepted Answer

temperature

Question 15

Which substance is called oil of vitriol?

Accepted Answer

Sulphuric acid

Question 16

Which among the following is used against the poison?

Accepted Answer

Antidote

Question 17

Materials for rain-proof coats and tents owe their water-proof properties to

Accepted Answer

surface tension

Question 18

A balloon contains 4 moles of an ideal gas with a volume of 5.0 L. If an additional 8 moles of the gas is added at const

Accepted Answer

15 litre

Question 19

To hit a target on land, at what point would you drop a bomb from an airplane?

Accepted Answer

Before the target

Question 20

What do you call an atom that has more protons than electrons?

Accepted Answer

a cation

Question 21

If the length of a pendulum is halved then its period of oscillation is

Accepted Answer

decreased by a factor

Question 22

Out of the following pairs, choose the pair in which the physical quantities do not have identical dimension?

Accepted Answer

Impulse and moment of force

Question 23

When pressure is increased the melting point of ice

Accepted Answer

decreases.

Question 24

Nuclear sizes are expressed in a unit named

Accepted Answer

Fermi

Question 25

Which of the following alloy is used in making a magnet?

Accepted Answer

Alnico

Question 26

All of the following elements are liquids around room temperature except which one?

Accepted Answer

MAGNESIUM

Question 27

A drop of food coloring spreading out in a cup of water is an example of which transport process?

Accepted Answer

DIFFUSION

Question 28

The symbol Sb stands for stibnum or stibnite. What is the modern name of this element?

Accepted Answer

ANTIMONY

Question 29

The speed of light in a medium ____________ with the rise in temperature of the medium.

Accepted Answer

increases

Question 30

For an electron with angular quantum number ℓ = 2, the magnetic quantum number m can have:

Accepted Answer

One of five possiblevalues

Let's Test Our Knowledge

Questions 30

Let's Test Our Knowledge

Questions 30