Questions 5 to 7 are based on the following activity. A balloon is fitted to the mouth of an empty glass bottle. The bottle is placed in water being heated in a pan. The balloon slowly gets inflated as shown in the photograph.
5. The balloon gets inflated because
(a) it gets heated and expands
(b) the air inside the bottle gets heated and expands
(c) the bottle gets heated and expands (
d) the water from the pan enters the balloon
6. What do you expect to happen if the bottle is taken out?
(a) The balloon will get deflated
(b) The bottle will break
(c) The balloon will burst
(d) None of these
7. The changes taking place in the balloon when the bottle is placed in the hot water and tak of it are (a) reversible
(b) irreversible
(c) chemical
(d) both physical and chemical E. Complete the following.
1. When you put some glucose in your mouth, your tongue feels cold because the dissolving glucose in saliva is an change.
2. The slaking of​