QUIZ

QUIZ QUESTIONS :

1.	Brass gets discoloured in air because of the presence of which of the following gases in air?
	A. Oxygen B. Hydrogen sulphide C. Carbon dioxide D. Nitrogen
2.Which of the following is used in pencils?
A. Graphite B. Silicon C. Charcoal D. Phosphorous
3.The gas usually filled in the electric bulb is
A. nitrogen B. hydrogen C. carbon dioxide D. Oxygen
4.Quartz crystals normally used in quartz clocks etc. is chemically
A. silicon dioxide B. germanium oxide C. a mixture of germanium oxide and silicon dioxide D. sodium silicate

	5.Permanent hardness of water may be removed by the addition of
	A. sodium carbonate B. alum C. potassium permanganate D. lime
6.Soda water contains
A. carbonic acid B. sulphuric acid C. carbon dioxide D. nitrous acid
	7.In fireworks, the green flame is produced because of
	A. sodium B. barium C. mercury D. potassium
	8.LPG consists of mainly
	A. methane, ethane and hexane B. ethane, hexane and nonane C. methane, hexane and nonane D. methane, butane and propane
9.The main constituents of pearls are
A. calcium oxide and ammonium chloride B. calcium carbonate and magnesium carbonate C. aragonite and conchiolin D. ammonium sulphate and sodium carbonate

10.A 33  half-watt resistor and a 330  half-watt resistor are connected across a 12 V source. Which one(s) will overheat?

A. 33  B. 330  C. both resistors D. neither resistor 11.In 0.025 W, there are A. 25 kW B. 0.00025 mW C. 2,500 µW D. 25 mW

12.

A given power supply is capable of providing 6 A for 3.5 h. Its ampere-hour rating is

A. 0.58 Ah B. 2.1 Ah C. 21 Ah D. 58 Ah

13.At the end of a 14 day period, your utility bill shows that you have used 18 kWh. What is your average daily power?

A. 1.286 kWh B. 12.85 kWh C. 535 kWh D. 252 kWh

14.A 6 V battery is connected to a 300  load. Under these conditions, it is rated at 40 Ah. How long can it supply current to the load?

A. 1 h B. 200 h C. 2,000 h D. 10 h

15.

How many watt-hours represent 65 W used for 18 h?

A. 11.7 Wh B. 1,170 Wh C. 11,700 Wh D. 117,000 Wh 16.For 12 V and 40 mA, the power is A. 480 mW B. 0.480 W C. 480,000 µW D. all of the above

17.

A half-watt is equal to how many milliwatts?

A. 5,000 mW B. 5 mW C. 500 mW D. 50 mW

18.

Three hundred joules of energy are consumed in 15 s. The power is

A. 2,000 W B. 2 W C. 20 W D. 200 W 19. How much continuous current can be drawn from a 60 Ah battery for 14 h? A. 42.8 A B. 428 A C. 4.28 A D. 4.2 A

20.

When the current through a 12 k resistor is 8 mA, the power is

A. 7.68 mW B. 768 mW C. 7.68 W D. 76.8 W Answers :  1.    B                   2.    A                        3.    A                   4.    A                          5.    A                   6.    C  7.    B                   8.    D  9.    B                 10.    D 11.   D                 12.    C 13.   A                 14.    C 15.   B                 16.    D 17.   C                 18.    C 19.   C                 20.    B