Science-Class-8 NCERT (NCERT Based General Studies (GS)): Questions 142 - 146 of 468

Get 1 year subscription: Access detailed explanations (illustrated with images and videos) to 3450 questions. Access all new questions we will add tracking exam-pattern and syllabus changes. View Sample Explanation or View Features.

Rs. 650.00 or

Question number: 142

» Science » Class-8 NCERT » Combustion and Flame (Fuel)

MCQ▾

Question

Characteristics of ideal fuel are:

Choices

Choice (4) Response

a.

Proper ignition temperature

AND

Should not produce toxic products

b.

Easy to handle, cheap and easily available

AND

Should not leave much residue after combustion

c.

High Calorific value

d.

All a. , b. and c. are correct

Question number: 143

» Science » Class-8 NCERT » Combustion and Flame (Fuel)

MCQ▾

Question

Synthetic gas is formed:

Choices

Choice (4) Response

a.

When powdered coal is heated with hydrogen under pressure in the presence of catalyst

b.

Powered coal is mixed with hot solvent

c.

Powered coke is mixed with hot solvent

d.

When coke is heated with hydrogen

Question number: 144

» Science » Class-8 NCERT » Combustion and Flame (Fuel)

MCQ▾

Question

Full form of CNG is:

Choices

Choice (4) Response

a.

Combined natural gas

b.

Combustion natural gas

c.

Compressed natural gas

d.

Compact Natural Gas

Question number: 145

» Science » Class-8 NCERT » Coal and Petroleum (Coal)

MCQ▾

Question

Coal gas is a mixture of:

Choices

Choice (4) Response

a.

Hydrocarbons with salt, water and earthly particles.

b.

Hydrogen, methane and carbon monoxide

c.

90 % carbon and is porous

d.

Sulphur, oxygen, nitrogen

Question number: 146

» Science » Class-8 NCERT » Coal and Petroleum (Exhaustible Natural Resources)

MCQ▾

Question

Tips for efficiency of vehicle and conserving environment are:

Choices

Choice (4) Response

a.

Ensuring correct tyre pressure so that the vehicle runs efficiently

AND

Switching off engine at traffic light

b.

Driving at a constant speed for better mileage and less pollution

c.

Avoid fast start and sudden breaking of automobiles

d.

All a. , b. and c. are correct

Sign In