Question 1

Why does milk turn sour?

Accepted Answer

Due to the action of bacteria.

Question 2

Why does not moon have an atmosphere?

Accepted Answer

Moon's thinness is  {10}^{-13}  times of the earth, so gases emanating from the surface escape into interplanetary vacuum.

Question 3

How are positive and negative charges produced during a thunderstorm?

Accepted Answer

Clouds are very small droplets of water in the form of vapour. When heavy, dark rain clouds called storm clouds develop high above the ground, strong winds move upwards through the light clouds and move the layer of clouds rub apart each other. As a result extremely large electric charges are produced in the cloud due to friction. The upper layers of clouds get positively charged and the lower layers of cloud get negatively charged.

Question 4

Are the lead pencils made of lead?

Accepted Answer

No. Powdered graphite is mixed with clay and pressed into sticks.

Question 5

Why is a person in a moving vehicle thrown forward when the vehicle stops suddenly?

Accepted Answer

A person in a moving vehicle is in a state of motion. Though the vehicle suddenly stops his body remains in a state of motion, so his body leans forward.

Question 6

Why is Miner's Safety Lamp a safe lamp?

Accepted Answer

The flame is covered by a gauze, so explosion does not occur on contact with inflammable gas.

Question 7

Why do water pipes, in hilly areas, often burst on a cold frosty night?

Accepted Answer

Water in the pipe freezes and on freezing water expands, so pipe break.

Question 8

Why is a small space left between each set of two rails of a railway line?

Accepted Answer

As the train moves heat is produced due to friction and due to heat rails expand. If no space is left they will bend.

Question 9

What is a 'formula' in Chemistry?

Accepted Answer

Formula is the symbolic expression for a molecule.

Question 10

The process of electric _______ between clouds and the earth or between different clouds causes _______.

Accepted Answer

The process of electric discharge between clouds and the earth or between different clouds causes lightning.

Basic Science

General Knowledge
2916 Views

Why does milk turn sour?

Why does not moon have an atmosphere?

How are positive and negative charges produced during a thunderstorm?

Are the lead pencils made of lead?

Why is a person in a moving vehicle thrown forward when the vehicle stops suddenly?

Why is Miner's Safety Lamp a safe lamp?

Why do water pipes, in hilly areas, often burst on a cold frosty night?

Why is a small space left between each set of two rails of a railway line?

What is a 'formula' in Chemistry?

The process of electric _ between clouds and the earth or between different clouds causes _.

Basic Science

General Knowledge 2916 Views

Why does milk turn sour?

Why does not moon have an atmosphere?

How are positive and negative charges produced during a thunderstorm?

Are the lead pencils made of lead?

Why is a person in a moving vehicle thrown forward when the vehicle stops suddenly?

Why is Miner's Safety Lamp a safe lamp?

Why do water pipes, in hilly areas, often burst on a cold frosty night?

Why is a small space left between each set of two rails of a railway line?

What is a 'formula' in Chemistry?

The process of electric _______ between clouds and the earth or between different clouds causes _______.

General Knowledge
2916 Views

The process of electric _ between clouds and the earth or between different clouds causes _.