HSA Mixed Practice Test #846

Question 1

The idiom 'on cloud nine' means:‌​‍

Accepted Answer

extremely happy or elated — On cloud nine = in a state of extreme joy.‌​‍

Answer

completely indifferent

Answer

slightly joyful and content

Answer

feeling confused or lost

Question 2

Uniform circular motion has:

Accepted Answer

Constant speed but varying velocity — Direction of velocity changes, so velocity vector changes — non-zero centripetal acceleration.

Answer

Constant velocity

Answer

Zero acceleration

Answer

Zero force

Question 3

Symbol of Sodium:

Accepted Answer

Na — Na (Natrium).

Answer

So

Answer

Sd

Answer

S

Question 4

Dobereiner's triads were arranged by:‌​‍

Accepted Answer

Atomic mass (middle ≈ mean of extremes) — E.g., Li(7), Na(23), K(39): (7+39)/2 = 23. Failed for many elements.‌​‍

Answer

Atomic number

Answer

Density

Answer

Valency

Question 5

Which instrument controls the resistance or current in a circuit?

Accepted Answer

Rheostat — Rheostat is a variable resistor used to control current.

Answer

Volta cell

Answer

Generator

Answer

Sonometer

Question 6

Rain gauge measures:‌​‍

Accepted Answer

Rainfall — Rain gauge measures the amount of rainfall in millimetres.‌​‍

Answer

Wind speed

Answer

Humidity

Answer

Temperature

Question 7

Curd contains:

Accepted Answer

Lactic acid — Lactic acid — from fermentation.

Answer

Citric acid

Answer

Acetic acid

Answer

Tartaric acid

Question 8

Bones in infant:‌​‍

Accepted Answer

300 — About 300 — many fuse during growth.‌​‍

Answer

270

Answer

206

Answer

350

Question 9

Number of diseases covered by Integrated Child Development Scheme:‌​‍

Accepted Answer

6 — ICDS covers 6 services including immunization against 6 vaccine-preventable diseases.‌​‍

Answer

4

Answer

5

Answer

10

Question 10

Aspirin (acetylsalicylic acid) is known to undergo hydrolysis, especially in the presence of moisture and heat. Which of the following products is formed when aspirin undergoes complete hydrolysis?

Accepted Answer

A. Salicylic acid and acetic acid — Aspirin is an ester of salicylic acid and acetic acid. Upon hydrolysis, the ester bond breaks, regenerating the parent carboxylic acid (salicylic acid) and acetic acid. This reaction is responsible for the characteristic vinegar-like smell of old aspirin and is a key degradation pathway.

Answer

B. Acetylsalicylic acid and ethanol

Answer

C. Phenol and benzoic acid

Answer

D. Salicylamide and methanol

HSA Mixed Practice Test #846