Heat Energy Worksheet-5

Heat Energy Worksheet-5

1. Amit found that a glass P was stuck inside another glass Q. What could he do to separate the two glasses

(a) Pour hot water into glass P and put glass Q in hot water.

(b) Pour hot water into glass P and put glass Q in cold water.

(c) Pour cold water into glass P and put glass Q in cold water.

(d) Pour cold water into glass P and put glass Q in hot water.

2. Mercury is used as a thermometer substance because

(a) It is very costly

(b) It expands less than glass

(c) It does not wet the wall of the glass tube

(d) None of these

3. Which canned drink will remain cold the longest?

(a) P                    (b) Q                   (c) R                    (d) None of these

4. Which one of the following will not help to cool down a cup of hot coffee?

(a) Stirring it continuously

(b) Adding ice to the coffee

(c) Pouring it into a bigger and winder cup

(d) Adding more sugar to the coffee

5. The materials in which convection takes place are :

(a) solids                                        (b) liquids

(c) gases                                         (d) liquid or gases

6. The process by which warm air goes out of a room from the top and cold air moves in from doors and windows naturally is called:

(a) air circulation                         (b) ventilation

(c) air rotation                              (d) none of these

7. The substances which easily catch fire in air or oxygen are called :

(a) flammable substances

(b) combustible substances

(c) flammable or combustible substances

(d) heat sensitive substances

8. Which is an incombustible substance?

(a) Petrol           (b) Mica             (c) Coal              (d) Tissue paper

9. Heat energy can bring about change in :

(a) temperature of a body          (b) dimensions of a body

(c) state of a body                         (d) any of these

10. The process due to which a given state of matter expands on the absorption of heat energy is called :

(a) molecular expansion             (b) matter expansion

(c) thermal expansion                 (d) thermal stretching

Answer Key:

1. (d)
2. (c)
3. (a)
4. (d)
5. (d)
6. (b)
7. (c)
8. (b)
9. (d)
10. (c)