Physics 2011 | Study Mode

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Question 31

If the charge of electricity is K wh is N4, what is the cost of operating an electrical appliance rated 250 v,2 A for six hours?

A

N28

B

N12

C

N16

D

N24

Explanation

Share Answer Energy consumed = power x time = lvt = 2 x 250 x 6hr = 300 wh = 3 kwh but 1 kwh = N4
3 kwh = 3 x N4 = N 12

Correct option: B

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Question 32

Under which of the following conditions do gases conduct electricity?

A

Low presssure and low p.d

B

low pressure and high p.d

C

high pressure an low p.d

D

high pressure and high p.d

Explanation

Share Answer Under high potential difference and low pressure gases are good conductor of electricity

Correct option: B

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Question 33

Two inductors of inductance 4 II and 8 II are arrange in series and a current of 10 A is passed through them. What is the energy stored in them?

A

500 J

B

50 J

C

133 J

D

250 J

Explanation

Share Answer Effective inductance
(1)/L = (1)/4 + (1)/8 = (3)/8
L = (8)/3
Energy stored = (1)/2 LI²
= (1)/2 x (8)/3 x 10 x 10 = (400)/3 = 133.3 J

Correct option: C

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Question 34

Which of the following materials has an increase in resistance with temperature?

A

water

B

metals

C

wood

D

electrolyte

Explanation

Share Answer Resistance in metals are proportional to temperature

Correct option: B

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Question 35

The bond between silicon and germanium is

A

covalent

B

ionic

C

dative

D

electrovalent

Explanation

Share Answer

Explanation not provided, please join discuss, your contributions are welcomed

Correct option: A

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Question 36

A radioactive isotope has a decay constant of 10^-5s⁴. Calculate half life

A

6.93 x 10⁵s

B

6.93 x 10⁵s

C

6.93 x10⁴s

D

6.93 x 10⁴s

Explanation

Share Answer T (1)/2 = (0.693)/ = (0.693)/10^-5
= 0.693 x 10⁵
= 6.93 x 10⁴ sec

Correct option: C

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Question 37

The electrical properties of germanium can be altered drastically by the addition of impurity. This process is referred to as

A

saturation

B

bonding

C

amplification

D

dopping

Explanation

Share Answer

Explanation not provided, please join discuss, your contributions are welcomed

Correct option: D

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Question 38

If the threshold frequency for tungsten is 1.3 x 10¹⁵Hz, what is its work function?


[H = 6.6 x 10^-34 Js]

A

8.58 x 10^-19 J

B

8.50 x 10^-15 J

C

8.58 x 10^-17 J

D

8.85 x 10^-18

Explanation

Share Answer Work function, w = hfo 6.6 x 10^-34 x 1.3 x 10¹⁵
= 8.58 x 10^-19

Correct option: A

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Question 39

Which of the following will be applied when a metal Y is used to electroplate another metal X in electrolysis?

A

X is the anode and very high current is used

B

X is the anode and Y is the cathode

C

Y is the cathode and X is the anode

D

Y is the anode and very high current is used

Explanation

Share Answer Metals and hydrogen are deposited at the cathode, while non-metals and oxygen are deposited on the anode
metals Y will form the anode which is deposited at the cathode made of x

Correct option: D

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Question 40

The diagram above shows two vectors at right angles to each other. The value of the resultant vector is

A

14.0 N

B

10.0 N

C

12.0 N

D

13.0 N

Explanation

Share Answer The resultant, R is given by pythagoras rule, R² = P² + Q²
= 6² + 8² = 36 + 64 = 100
R = 100 = 10.0N

Correct option: B

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