Question

Match the following.

a. Telephone ringing	i. Effect of noise
b. Human heartbeat	ii. Loud sound
c. Headache	iii. $60\text{dB}$
d. Conversation	iv. Sound in silence

• A. a - ii, b - i, c - iv, d - iii
• B. a - iii, b - iv, c - i, d - ii
• C. a - i, b - iv, c - ii, d - iii
• D. a - ii, b - iv, c - i, d - iii

Answer 1

The correct option is D a - ii, b - iv, c - i, d - iii

• Telephone ringing is a warning sound and hence, is always loud.
• Human heartbeat is a soft sound which can be heard only in silence.
• Exposure to loud noise causes health problems like headache and hypertension.
• Conversations are usually pleasant and soft with a loudness of about $60\text{dB}$.