
Q1. The plastic material commonly used for making gear wheels is
(a) Polyesters
(b) Nylons
(c) Bakelit
(d) Polystyrene
Q2. Ultra violet radiation of the Sun do not reach the earth because, earth’s atmosphere is surrounded by
(a) Carbon dioxide
(b) Ammonia
(c) Chlorine
(d) Ozone
Q3. “Curie” is unit of:
(a) Radioactivity
(b) Temperature
(c) Heat
(d) Energy
Q4. Which of the following is used in oven?
(a) X-rays
(b) UV rays
(c) Microwaves
(d) Radiowaves
Q5. When heated from 0° to 10°C volume of a give mass of water will:
(a) Increase gradually
(b) Decreases gradually
(c) Increase and then will decrease
(d) Decrease and then will increase
Q6. Energy is continuously created in the sun due to:
(a) nuclear fusion
(b) nuclear fission
(c) radioactivity
(d) artificial radioactivity
Q7. In electronics what comes under tank circuit?
(a) Resistance and capacity
(b) Resistance and inductance
(c) Capacity and inductance
(d) Resistance, capacity and inductance
Q8. Coolis tube is used to produce
(a) Radio waves
(b) Micro waves
(c) X-rays
(d) Gamma rays
Q9. Which of the following is used for regulated electric supply?
(a) Zener diode
(b) Junction diode
(c) Gun diode
(d) Tunnel diode
Q10. The source of the Sun’s energy is the process of
(a) Photoelectric emission
(b) Nuclear fission
(c) Nuclear fusion
(d) Thermionic emission
Solutions
S1. Ans.(b)
S2. Ans.(d)
S3. Ans.(a)
S4. Ans.(c)
S5. Ans.(d)
S6. Ans.(a)
S7. Ans.(c)
S8. Ans.(c)
S9. Ans.(a)
S10. Ans.(c)