science objective type questions and answers

science objective type questions and answers
General Science Quiz - Multiple Choice Questions with Answers
General Science - General Knowledge Questions and Answers
1. If 10 g of ice at 0°C mixes with l0 g of water at 10°C, then the final temperature
t is given by
(a) (10 x 80) + 10(t-0) = 10(10-t)
(b) 10 x 80 = 10(10-t) + 10(t-0)
(c) t = 5°C
(d) t = 0°C
Ans. (d)

2. The amount of heat required for the above operation is
(a) 380 cal
(b) 500 cal
(c) 4.2 cal
(d) none of these
Ans. (d)

3. One joule is approximately equal to
(a) 0.28 cal
(b) 0.32 cal
(c) 0.24 cal
(d) 4.2 cal
Ans. (c)

4. M g of ice at 0°C is to be converted to water at 0°C. If L is the latent heat of
fusion of ice, the quantity of heat required for the above operation would be
(a) MLca1
(b) M/ L
(c) L/ M
(d) none of these
Ans. (a)

5. Two bodies A and B are said to be in thermal equilibrium with each other, if
(a) heat flows from A to B
(b) heat flows from B to A
(c) both the bodies lose equal amounts of heat to the atmosphere
(d) heat does not flow from either A or B
Ans. (d)

6. If a substance contracts on heating, its coefficient of linear expansion is
(a) +ve
(b) -ve
(c) zero
(d) infinity
Ans. (b)


7. The units of RH are
(a) kg-m-3
(b) kg
(c) kg-m2
(d) none of these
Ans. (d)

8. If RH is high
(a) we feel sultry
(b) we perspire less
(c) clothes do not dry easily
(d) all the above are correct
Ans. (d)

9. When it is raining, the dew point is
(a) 0°C
(b) 100°C
(c) 50°C
(d) room temperature
Ans. (d)


10. The most comfortable value for RH is
(a) 10%
(b) 20%
(c) 30%
(d) 90%
Ans. (c)

11. When the temperature of water rises, the rate of evaporation
(a) increases
(b) decreases
(c) remains the same
(d) first decrease then increases
Ans. (a)

12. The first thermometer was developed by
(a) Joule
(b) Fahrenheit
(c) Galileo
(d) Watt
Ans. (c)



13. The relative humidity is 50%, if air contains about
(a) 2.55 g of water Vapour at 40°C
(b) 25.5 g of water Vapour at 40°C
(c) 2.55 kg of water Vapour at 40°C
(d) 25.5 kg of water Vapour at 40°C
Ans. (b)

14. Relative humidity is the percentage of the
(a) absolute humidity value to the amount of humidity actually present
(b) increase of humidity/absolute humidity
(c) amount of humidity actually present to the
(d) none of these
Ans. (c)

15. Evaporation is the process of changing liquid into vapour
(a) at any temperature
(b) above, its boiling point
(c) at its boiling point
(d) below its boiling point
Ans. (d)

16. When we cool a gas below its point, the KE of its molecules
(a) increases
(b) decreases
(c) remains the same
(d) first increases then decreases
Ans. (b)

17. A piece of ice at 0°C is added to a vessel containing water at 0°C, then
(a) all of the ice will melt
(b) some ice will melt
(c) no ice will melt
(d) the temperature will decrease further
Ans. (c)

18. At high temperature, the molecules of a substance
(a) move more vigorously
(b) move less vigorously
(c) become stationary
(d) are attracted strongly
Ans. (a)

19. Fahrenheit scale divides two fixed points into
(a) l80 parts
(b) 2l2 parts
(c) 100 parts
(d) 32 parts
Ans. (a)

20. Celsius scale divides two fixed points into
(a) 180 parts
(b) 212 parts
(c) 100 parts
(d) 32 parts
Ans. (c)


21. Two rods, one of iron and the other of aluminum, are heated to the same
temperature. Then,
(a) the iron rod will expand less
(b) the iron rod will expand more
(c) both rods will expand equally
(d) the iron rod will not expand at all
Ans. (a)

22. When steam condenses into water its
(a) temperature remains the same
(b) heat dissipates
(c) temperature increases
(d) temperature decreases
Ans. (b)

23. Two blocks of steel A and B, A being two times heavier than B, are at 40°C.
The ratio of heat content of A to B is
(a) 1
(b) 4
(c) 2
(d) 1/ 2
Ans. (c)

24. When 60 calories of heat are supplied to 15 g of water, the rise in temperature is
(a) 75°C
(b) 900°C
(c) 4°C
(d) 0.25°C
Ans. (c)

25. A 10kg storage battery has an average specific heat of 0.2 kcal/kg°C. When fully
charged, the energy content of the battery is 1 kcal. If the entire energy were used
to raise the temperature, then the temperature would increase by
(a) 0.2°C
(b) 0.5°C
(c) 200°C
(d) 20°C
Ans. (b)