Physics-Magnetism & Electricity at Work (NTSE Stage-2 (National-Level) Scholastic-Aptitude & Language Comprehension): Questions 4 - 6 of 10

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Question number: 4

» Physics » Magnetism & Electricity at Work

MCQ▾

Question

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.

concentric circle

c.

zig-zag manner

d.

straight line

Question number: 5

» Physics » Magnetism & Electricity at Work

MCQ▾

Question

Two electromagnets shown in the figure above

Two Electromagnets Shown in the Figure Above

Both electromagnets consist of a coil of insulated wire wrapped around an iron core.

Both electromagnets (A) and (B) consist of a coil of insulated wire wrapped around an iron core. Then,

Choices

Choice (4) Response
a.

electromagnet (A) has more strength of magnetic field

b.

electromagnet (B) has more strength of magnetic field

c.

Data insufficient

d.

electromagnets (A) and (B) have same strength of magnetic field

Question number: 6

» Physics » Magnetism & Electricity at Work

MCQ▾

Question

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.

two times that of wire W1

b.

four times that of wire W1

c.

sixteen times that of wire W1

d.

same as that of wire W1

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