A small block is shot into each of the four tracks as shown below. Each of the tracks rises to the same height. The speed with which the block enters the track is the same in all cases. At the highest point of the track, the normal reaction is maximum in:

(1)
(2)
(3)    
(4)     Same in all cases

 

Subtopic:  Work Energy Theorem |
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A stone tied to a string of length L is whirled in a vertical circle with the other end of the string at the centre. At a certain instant of time, the stone is at its lowest position and has a speed u. The magnitude of the change in its velocity as it reaches a position where the string is horizontal is:

(1) u22gL

(2) 2gL

(3) u2gl

(4) 2(u2gL)

Subtopic:  Work Energy Theorem |
From NCERT
PMT - 2004
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The driver of a car travelling at velocity v suddenly sees a broad wall in front of him at a distance d. He should 

(1) Brake sharply

(2) Turn sharply

(3) (1) and (2) both

(4) None of the above

Subtopic:  Concept of Work |
From NCERT
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Which of the following graph depicts spring constant k versus length l of the spring correctly

(1)
(2)
(3)
(4)
Subtopic:  Elastic Potential Energy |
 68%
From NCERT
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Work done by a frictional force is

(1) Negative

(2) Positive

(3) Zero

(4) All of the above

Subtopic:  Concept of Work |
 61%
From NCERT
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A block of mass 50 kg slides over a horizontal distance of 1 m. If the coefficient of friction between their surfaces is 0.2, then work done against friction is 

(1) 98 J

(2) 72J

(3) 56 J

(4) 34 J

Subtopic:  Concept of Work |
 84%
From NCERT
AIIMS - 2000
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A body of mass m is moving in a circle of radius r with a constant speed v. The force on the body is mv2r and is directed towards the centre. What is the work done by this force in moving the body over half the circumference of the circle

(1) mv2πr2

(2) Zero

(3) mv2r2

(4) πr2mv2

Subtopic:  Concept of Work |
 84%
From NCERT
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A man pushes a wall and fails to displace it. He does:
1. negative work
2. positive but not maximum work
3. no work at all
4. maximum work

Subtopic:  Concept of Work |
 87%
From NCERT
PMT - 1992
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A body moves a distance of 10 m along a straight line under the action of a force of 5 N. If the work done is 25 joules, the angle which the force makes with the direction of motion of the body is

(1) 0°

(2) 30°

(3) 60°

(4) 90°

Subtopic:  Concept of Work |
 87%
From NCERT
PMT - 1999
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A force acts on a 30 gm particle in such a way that the position of the particle as a function of time is given by x=3t4t2+t3, where x is in metres and t is in seconds. The work done during the first 4 seconds is 

(1) 5.28 J

(2) 450 mJ

(3) 490 mJ

(4) 530 mJ

Subtopic:  Work Done by Variable Force |
 61%
From NCERT
PMT - 1998
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