Chapter 4: Heating & Cooling - Science For Grade 8(Science ) Questions and answers for exam Preparation

Question 1. In SI unit of temperature is

Degree C
F
K
Ampere

Explanation:-

Answer: Option C. -> K
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 2. Materials trapped air by fur, feathers, wool and sawdust are heat

insulators
conductors
gainers
losers

Explanation:-

Answer: Option A. -> insulators
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 3. A solar panel is kept black surface so that it absorbs more

heat
water
air
oxygen

Explanation:-

Answer: Option A. -> heat
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 4. A joint which is made between adjoining rails to expand without bending is called

rail joint
sliding joint
expansion joint
contraction joint

Explanation:-

Answer: Option B. -> sliding joint
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 5. In melting of ice cube the heat gain

melts ice
increase temperature
gain energy
release energy

Explanation:-

Answer: Option A. -> melts ice
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 6. A very good conductors of heat contains

metals
non-metals
liquids
gases

Explanation:-

Answer: Option A. -> metals
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 7. Heat loss may help the matter to

expand
contract
spread
stable

Explanation:-

Answer: Option B. -> contract
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 8. Water freezes at

98 C
100 C
97 C
0 C

Explanation:-

Answer: Option D. -> 0 C
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 9. Railway tracks have gaps between them to deal with expansion in

hot days
cold days
winters
snow fall

Explanation:-

Answer: Option A. -> hot days
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 10. Mercury is

harmless
safe
non-toxic
poisonous

Explanation:-

Answer: Option D. -> poisonous
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!