Which of the following process / processes release heat ?
(i) condensation (ii) vaporisation (iii) freezing (iv) melting

(a) only (i) (b) only (iv) (c) (i) and (iii) (d) (ii) and (iv)

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Solution

i) .Condensation and iii).freezing give off heat
option c is correct

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Question 12

Which of the following is (are) an endothermic process(es)?

(i) Dilution of sulphuric acid.
(ii) Sublimation of dry ice.
(iii) Condensation of water vapours.
(iv) Evaporation of water.

(a) (i) and (iii)
(b) (ii) only
(c) (iii) only
(d) (ii) and (iv)

Q. Question 3
Which of the following statements are correct?
(i) Sound is produced by vibrations.
(ii) Sound requires a medium for propagation.
(iii) Light and sound both require a medium for propagation.
(iv) Sound travels slower than light.

(a) i, ii and iv only
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(c) i, ii and iii only
(d) ii, iii and iv only

Q. Which of the following can sometimes be 'zero' for a moving body?

(i) average velocity
(a) only (i)

(ii) distance travelled
(b) (i) and (ii)

(iii) average speed
(c) (i) and (iv)

(iv) displacement
(d) only (iv)

Q. Question 3
Which of the following statements are correct?
(i) Sound is produced by vibrations.
(ii) Sound requires a medium for propagation.
(iii) Light and sound both require a medium for propagation.
(iv) Sound travels slower than light.

(a) i, ii and iv only
(b) i and ii only
(c) i, ii and iii only
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If p = n(m+n)(m+n-1)m, which of the following are the factors of p (Given p,n,m are natural numbers).

(i) n

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Which of the following process / processes release heat ? (i) condensation (ii) vaporisation (iii) freezing (iv) melting (a) only (i) (b) only (iv) (c) (i) and (iii) (d) (ii) and (iv)

i) .Condensation and iii).freezing give off heat option c is correct

Which of the following process / processes release heat ?
(i) condensation (ii) vaporisation (iii) freezing (iv) melting

(a) only (i) (b) only (iv) (c) (i) and (iii) (d) (ii) and (iv)

i) .Condensation and iii).freezing give off heat
option c is correct