Physics-Magnetism & Electricity at Work [NTSE Stage-2 (National-Level) Scholastic-Aptitude & Language Comprehension]: Questions 5 - 8 of 10

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Question 5

Question MCQ▾

The pattern in which the iron filings will align, if a current carrying straight conductor is kept in the mid of iron filling, is

Choices

Choice (4)Response

a.

remain as such

b.

straight line

c.

concentric circle

d.

zig-zag manner

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Question 6

Appeared in Year: 2013

Question MCQ▾

Three different circuits (I, II and III) are constructed using identical batteries and resistors of R and 2R ohm. What can be said about current I in arm AB of each circuit?

Three Different Circuits Constructed Using Resistors

Choices

Choice (4)Response

a.

b.

c.

d.

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Question 7

Appeared in Year: 2013

Question MCQ▾

Consider a simple circuit containing a battery and three identical incandescent bulbs A, B and C. Bulb A is wired in parallel with bulb B and this combination is wired in series with bulb C. What would happen to the brightness of the other two bulbs if bulb A were to burn out?

Choices

Choice (4)Response

a.

Bulb B would get brighter and bulb C would get dimmer

b.

Only bulb B would get brighter

c.

There would be no change in the brightness of either bulb B or bulb C

d.

A and B would get brighter

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Question 8

Question MCQ▾

In an experiment, it was observed that when the length of a wire in an electrical circuit is doubled, everything else remaining same, the current becomes half. On the other hand, if the thickness (diameter) of the wire is doubled, the current becomes 4 times. Two wires W1 and W2 of the same metal have the same current passing through them. The thickness of wire W2 is twice that of W1, then the length of the wire W2 is

Choices

Choice (4)Response

a.

sixteen times that of wire W1

b.

two times that of wire W1

c.

four times that of wire W1

d.

same as that of wire W1

Edit