BITSAT Physics: Questions 67 - 71 of 313

Get 1 year subscription: Access detailed explanations (illustrated with images and videos) to 313 questions. Access all new questions we will add tracking exam-pattern and syllabus changes. View Sample Explanation or View Features.

Rs. 250.00 or

Question number: 67

» Gravitation » Gravitational Acceleration

MCQ▾

Question

At what height from the earth surface, the acceleration of gravity will be half the value of g at surface? (R=6400km).

Choices

Choice (4) Response

a.

1600km

b.

4800km

c.

8200km

d.

6400km

Question number: 68

» Current Electricity » Temperature Dependence of Resistance

MCQ▾

Question

If a wire of resistance 20Ω is covered with ice and a voltage of 210V is applied across the wire then rate of melting of ice will be –

Choices

Choice (4) Response

a.

0.85gs

b.

6.56gs

c.

6.56gs

d.

All of the above

Question number: 69

» Current Electricity » Electrical Energy and Power

MCQ▾

Question

10Ω electric heater operates on a 110V line, then the rate at which it develops heat in watts will be –

Choices

Choice (4) Response

a.

670

b.

810

c.

1210

d.

1310

Question number: 70

» Oscillations and Waves » Displacement Relation for a Progressive Wave

MCQ▾

Question

A wave frequency 100Hz is send along a string towards a fixed end. When this wave travels back, after reflection, a node is formed at a distance of 10cm from the fixed end of the string. The speeds of incident (and reflected) waves are –

Choices

Choice (4) Response

a.

20ms

b.

10ms

c.

15ms

d.

48ms

Question number: 71

» Laws of Motion » Force and Inertia

MCQ▾

Question

The earth (mass=6×1024kg) revolves around the sun with an angular velocity 2×107radsec in a circular orbit of radius 1.5×108km . The force exerted by sun on earth in newton is –

Choices

Choice (4) Response

a.

Zero

b.

29×1039

c.

18×1025

d.

36×1021

f Page
Sign In