Physics-Magnetism & Electricity at Work (NTSE Stage-1 (State-Level) Scholastic-Aptitude & Language Comprehension): Questions 33 - 37 of 46

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Question number: 33

» Physics » Magnetism & Electricity at Work

Appeared in Year: 2013

MCQ▾

Question

An electric iron draws a current of 15 A from 220V supply. What is the cost of using iron for 30 min every day for 15 days if the cost of unit (1 unit = 1 KW/hr) is 2 rupees?

Choices

Choice (4) Response
a.

Rs. 60

b.

Rs. 40

c.

Rs. 10

d.

Rs49.5

Question number: 34

» Physics » Magnetism & Electricity at Work

MCQ▾

Question

A technician has 10 resistors each of resistance 0.1Ω. The largest and smallest resistances that he can obtain by combining these resistors are

Choices

Choice (4) Response
a.

1 Ω and 0.01 Ω respectively

b.

1 Ω. and 0.1 Ω respectively

c.

10 Ω and 1 Ω respectively

d.

0.1 Ω and 0.01 Ω. Respectively

Question number: 35

» Physics » Magnetism & Electricity at Work

MCQ▾

Question

Eight identical spherical mercury drops charged to a potential of 20 V each are coalesced into a single spherical drop

Choices

Choice (4) Response
a.

Internal energy of the system decreases

b.

The potential remains the same i. e. , 20 V

c.

The internal energy of the system remains the same

d.

The new potential of the drop is 80 V

Question number: 36

» Physics » Magnetism & Electricity at Work

MCQ▾

Question

Two rods of same material and length have their electric resistance in ratio 1: 2. When both rods are dipped in water, the correct statement will be

Choices

Choice (4) Response
a.

Loss of weight will be in the ratio 1: 2

b.

A has more loss of weight

c.

B has more loss of weight

d. Both b. and c. are correct

Question number: 37

» Physics » Magnetism & Electricity at Work

MCQ▾

Question

Ohm’s law is true

Choices

Choice (4) Response
a.

for gases at low temperature

b.

for electrolytes when current passes through them

c.

for metallic conductor

d.

for diode when current flows

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