# Physics-Magnetism & Electricity at Work (NTSE Stage-1 (State-Level) Scholastic-Aptitude & Language Comprehension): Questions 26 - 30 of 47

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## Question number: 26

» 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: 27

» 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: 28

» 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

## Question number: 29

» Physics » Magnetism & Electricity at Work

MCQ▾

### Question

The masses of the three wires of copper are in the ratio and their lengths are in the ratio 1: 3: 5. The ratio of their electrical resistance is

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 30

» Physics » Magnetism & Electricity at Work

MCQ▾

### Question

Three equal resistors each equal to “r” are connected as shown in figure. The equivalent resistance between points A and B is

### Choices

Choice (4) Response

a.

b.

r

c.

3r

d.

r

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