KVPY Stream SB-SX (Class 12 & 1st Year BSC) Physics: Questions 170 - 173 of 250

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Question number: 170

» Work, Energy and Power » Work Done

MCQ▾

Question

A particle of mass 1 kg has potential energy, P.E.=5x+12y . At t=0 , the particle is at rest (5, 3). Work done by external force to displace the particle from rest to the point of crossing the x axis is –

Choices

Choice (4) Response
a.

13 J

b.

1692J

c.

1694J

d.

169 J

Question number: 171

» Laws of Motion » Static and Kinetic Friction

Appeared in Year: 2015

MCQ▾

Question

A small box resting on one edge of the table is struck in such a way that it slides off the other edge, 1 m away, after 2 seconds. The coefficient of kinetic friction between the box and the table –

Choices

Choice (4) Response
a.

Must be exactly 0.05

b.

Must be exactly zero

c.

Must be less than 0.05

d.

Must be more than 0.05

Question number: 172

» Magnetic Effects of Current and Magnetism » Current Loop as Magnetic Dipole

MCQ▾

Question

Two concentric circular coils of radius 14 cm and 40.0 cm having 45 and 20 number of turns carry currents 0.2 A and 0.48 A respectively and in opposite direction. The magnetic field produced at the common centre is –

Choices

Choice (4) Response
a.

0.253 gauss perpendicular to the plane of the coil downward

b.

0.253 gauss perpendicular to the plane of the coil upward

c.

0.253 gauss perpendicular to the plane of the coil may be upward or downward

d.

0.253 gauss in the plane of the coil

Question number: 173

» Kinematics » Motion in a Straight Line

Appeared in Year: 2015

MCQ▾

Question

A boy is standing on top of a tower of height 85 m and throws a ball in the vertically upward direction with a certain speed. If 5.25 seconds later he hears the ball hitting the ground, then the speed with which the boy threw the ball is (take g=10ms2 , speed of sound in air =340ms )

Choices

Choice (4) Response
a.

6ms

b.

12ms

c.

10ms

d.

8ms

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