Chemistry Practice Questions Set 5

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Which one of the following polymeric materials are used for making bulletproof jackets?
*

1 point

Nylon-6, 6

Rayon

Kevlar

Dacron

Some statements about the benefits of organic farming are given below. Indicate whether they are true or false using the codes given below the statements:

1. It reduces CO₂ emissions.
2. It does not lead to toxic effects.
3. It improves the water–retention capacity of the soil.

1 point

1 False, 2 True, 3 False

1 True, 2 False, 3 False

1 False, 2 True, 3 True

1 True, 2 False, 3 True

Match List l with List ll and select the correct answer using the codes given below the Lists.
List-l
(Alloy)
A. Solder
B. Brass
C. Bronze
D. Steel
List-ll
(Constituent)
1. Iron and carbon
2. Copper and zinc
3. Copper and tin
4. Lead and tin
*

1 point

A 1, B 2, C 3, D 4

A 4, B 2, C 3, D 1

A 1, B 3, C 2, D 4

A 4, B 3, C 2, D 1

Which of the following statements about the commonly used automobile battery are true?

l. It is usually a lead-acid battery.
ll. It has six cells with a potential of 2 V each.
lll. Its works as galvanic ceils while discharging power.
IV. Its cells work as electrolytic cells while recharging.
Select the correct answer using the codes given below

1 point

l. ll, lll and IV

l, ll and lll

ll and IV

lll and IV

Which among the following elements is abundant on the lunar surface and holds the potential to put an end to the energy crisis of the earth?
*

1 point

Helium-I

Helium-II

Helium-III

Helium-IV

If a limestone piece is dipped in water, a bubble evolves. The bubbling is due to ___
*

1 point

hydrogen

oxygen

water vapor

carbon dioxide

The light emitted by firefly is due to
*

1 point

a radioactive substance

chemiluminiscence process

a photoelectric process

burning of phosphorus

The coil in a heater is made of
*

1 point

nichrome

tungsten

copper

iron

Match List l with List ll and select the correct answer using the codes given below the Lists.
List-l
(Items)
A. CFL Lamp
B. Automobile battery
C. Polymer
D. Diesel engine
List-ll
(Toxic substance)
1. Nitrogen oxides
2. Phthalates
3. Lead
4. Mercury
*

1 point

A 4, B 2, C 3, D 1

A 4, B 3, C 2, D 1

A 1, B 2, C 3, D 4

A 1, B 3, C 2, D 4

Which one of the following chemicals are commonly used by farmers to destroy weeds?
*

1 point

DDT

Malathion

Methyl bromide

2, 4-D

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