# Physics-Magnetism & Electricity at Work (NTSE Stage-1 (State-Level) Scholastic-Aptitude & Language Comprehension): Questions 25 - 29 of 47

Get 1 year subscription: Access detailed explanations (illustrated with images and videos) to 1058 questions. Access all new questions we will add tracking exam-pattern and syllabus changes. View Sample Explanation or View Features.

Rs. 450.00 or

## Question number: 25

» 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: 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.

f Page