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Lightning : Introduction

Fill in the b...

Question

Fill in the blanks with the correct words.
1. .................... (Friction/Pressure) is defined as the force per unit area.
2. The sound produced is controlled by .................... (larynx/vocal cord).
3. .................... (Anode/Cathode) is the object to be used for coating in electrolysis.
4. 20.95% of the air is made up of .................... (nitrogen/oxygen).
5. .................... (CNG/Diesel) is a less polluting fuel.

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Solution

1. Pressure is defined as the force per unit area.
2. The sound produced is controlled by larynx.
3. Anode is the object to be used for coating in electrolysis.
4. 20.95% of the air is made up of oxygen.
5. CNG is a less polluting fuel.

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Q. In a hydrogen oxygen fuel cell, electricity is produced. In this process

H_{2} (g)

is oxidised at anode and

O_{2} (g)

reduced at cathode. Given : Cathode:

O_{2} (g) + 2 H_{2} O (l) + 4 e^{-} \to 4 O H^{-} (a q)

H_{2} (g) + 2 O H^{-} (a q) \to 2 H_{2} O (l) + 2 e^{-}

4.48 L

H_{2}

1 atm

273 K

9650 sec

.
If current produced in fuel cell, use for the deposition of

C u^{2 +}

1 L

2 M C u S O_{4} (aq)

241.25 sec

P t

p H

of solution after electrolysis is:

Fill in the blanks:

(a) Burning of wood and coal causes _______ __ of air.

(b) A liquid fuel used in homes is ___________.

(c) Fuel must be heated to its ___________ before it starts burning.

(d) Fire produced by oil cannot be controlled by ________ _.

Q. Fill in the blanks with the correct words.
1. .................... (Gravitational/Electrostatic) force makes the Earth move around the sun and also makes the moon go around the Earth.
2. Atmospheric pressure is measured using an instrument called the .................... (barometer/biometer).
3. Objects that produce sound are called .................... (voice/sonorous).
4. Burning of fossil fuels like coal and petroleum in thermal power plants releases .................... (carbon dioxide/sulphur dioxide) and nitrogen.
5. The distance travelled by light in one year is called a .................... (satellite/light year).

Q. Fill in the blanks with the correct words.
1. Alcohol is a .................... (good/bad) conductor of electricity.
2. Dilute solutions of acids .................... (can/cannot) be used as electrolytes.
3. Positively charged ions are called .................... (anions/cations).
4. Anode mud gets .................... .................... (deposited on/collected below) the anode.
5. The process of .................... (electroplating/electrorefining) can be used to purify metals.

Q. Fill in the blanks :

1. Shape of an object can be changed by.......

2. Force acting per unit area of surface is.....

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