Physics (NTSE Stage-1 (State-Level) Scholastic-Aptitude & Language Comprehension): Questions 97 - 101 of 133

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Question number: 97

» Physics » Magnetism & Electricity at Work

Appeared in Year: 2013

MCQ▾

Question

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.

12 W

b.

30W

c.

10W

d.

90W

Question number: 98

» Physics » Work and Energy

Appeared in Year: 2013

MCQ▾

Question

Two different sources of light A and B have wavelength 0.7 A m and 0.3 A m respectively. Then which of the following statement is true:

Choices

Choice (4) Response

a.

A has greater energy then B

b.

A and B has equal energy

c.

B has greater energy then A

d.

All of the above

Question number: 99

» Physics » Magnetism & Electricity at Work

Appeared in Year: 2013

MCQ▾

Question

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.

Rs. 60

b.

Rs. 40

c.

Rs. 10

d.

Rs49.5

Question number: 100

» Physics » Motion and Force

Appeared in Year: 2013

MCQ▾

Question

The speed-time relation of a car whose weight is 1500 kg has shown in the given graph. How much braking force has been applied at the end of 7sec. to stop the car in 2 sec?

Graph of Speed vs. Time

Graph of Speed vs. Time

Calculate the breaking force of the car at end of 7 sec to stop the car

Choices

Choice (4) Response

a.

1200N

b.

9000N

c.

4800N

d.

2000N

Question number: 101

» Physics » Motion and Force

Appeared in Year: 2013

MCQ▾

Question

The speeds of sound in air and sea-water are given to be 340 m/s and 1440 m/s, respectively. A ship sends a strong signal straight down and detects its echo after 1.5 s. The depth of the sea at that point is

Choices

Choice (4) Response

a.

0.255 km

b.

2.16 km

c.

1.08 km

d.

0.51 km

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