Physics-Magnetism & Electricity at Work [NTSE Stage-1 (State-Level) Scholastic-Aptitude & Language Comprehension]: Questions 19 - 24 of 47
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Question 19
Question MCQ▾
The area enclosed by a hysteresis loop is a measure of
Choices
Choice (4) | Response | |
---|---|---|
a. | permeability | |
b. | retentivity | |
c. | susceptibility | |
d. | energy loss per cycle |
Question 20
Question MCQ▾
Magnetic lines of force due to a bar magnet do not intersect because
Choices
Choice (4) | Response | |
---|---|---|
a. | the lines have similar charges and so repel each other | |
b. | the lines always diverge from a single point | |
c. | a point always has a single net magnetic field | |
d. | None of the above |
Question 21
Question MCQ▾
Find the current in the given circuit
Choices
Choice (4) | Response | |
---|---|---|
a. | ||
b. | ||
c. | ||
d. | None of the above |
Question 22
Question MCQ▾
When the magnet is brought near the iron needle, it act as
Choices
Choice (4) | Response | |
---|---|---|
a. | non-magnetic material | |
b. | bar-magnetic | |
c. | temporary magnet | |
d. | None of the above |
Question 23
Appeared in Year: 2013
Question MCQ▾
Three equal resistors connected in series across a source of emf dissipate 10 watts of power. What will be the power dissipated is watts if the same resistors are connected in parallel across the same source of emf?
Choices
Choice (4) | Response | |
---|---|---|
a. | 10W | |
b. | 12 W | |
c. | 30W | |
d. | 90W |
Question 24
Appeared in Year: 2013
Question MCQ▾
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. | ₹ 10 | |
b. | ₹ 60 | |
c. | Rs49.5 | |
d. | ₹ 40 |