BITSAT Physics: Questions 133 - 137 of 158

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Question number: 133

» Kinematics » Motion in a Plane

MCQ▾

Question

A bomb is dropped from an aero plane moving horizontally at constant speed. If air resistance is taken into consideration, then the bomb –

Choices

Choice (4) Response

a.

Falls on the earth exactly behind the aero plane

b.

Flies with the aero plane

c.

Falls on earth exactly below the aero plane

d.

Falls on the earth ahead of the aero plane

Question number: 134

» Kinematics » Uniformly Accelerated Motion

MCQ▾

Question

The displacement x of a particle moving along a straight line at time t is given by

x=ao+a1t+a2t

The acceleration of the particle is –

Choices

Choice (4) Response

a.

4a2

b.

a2

c.

2a1

d.

2a2

Question number: 135

» Dual Nature of Matter and Radiation » Particle Nature of Light

MCQ▾

Question

A luminous efficiency of a lamp is 4lumenwatt and its luminous intensity is 30candela . The power of lamp is

Choices

Choice (4) Response

a.

78W

b.

136W

c.

60W

d.

94W

Question number: 136

» Properties of Solids & Liquids » Young's Modulus

MCQ▾

Question

An iron rod of length 2m and cross-sectional area of 50mm2 stretched by 0.5mm , when a mass of 250kg is hung from its lower end. Young’s modulus of iron rod is –

Choices

Choice (4) Response

a.

19.6×1015Nm2

b.

19.6×1010Nm2

c.

19.6×1020Nm2

d.

19.6×1018Nm2

Question number: 137

» Rotational Motion » Torque

MCQ▾

Question

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

Choices

Choice (4) Response

a.

36×1021N

b.

18×1025N

c.

6×1019N

d.

27×1039N

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