Mechanics CDS Questions

CDS Physics

Mechanics MCQ Questions


13.
A body at rest breaks into two pieces of equal masses. The part will move
A.
In same direction
B.
Along Different lines
C.
In opposite directions with equal speeds
D.
In opposite directions with unequal speeds
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ANSWER :
C. In opposite directions with equal speeds
14.
An electric generator converts
A.
Electrical energy into chemical energy
B.
Chemical energy into electrical energy
C.
Electrical energy into mechanical energy
D.
Mechanical energy into electrical energy
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ANSWER :
D. Mechanical energy into electrical energy
15.
If a body of mass m collides head on, elastically with velocity u with another identical body at rest. After collision velocity of the second body will be
A.
Zero
B.
u
C.
2u
D.
u/2
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ANSWER :
B. u
16.
A machine gun fires 60 bullets per minute with a velocity of 700 m/s. If each bullet has a mass of 50 g. The power developed by the gun is
A.
50 W
B.
250 W
C.
2250 W
D.
12250 W
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ANSWER :
D. 12250 W
17.
How much does the kinetic energy increase if the momentum is increased by 20%
A.
44%
B.
55%
C.
66%
D.
77%
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ANSWER :
A. 44%
18.
The energy required to move a 60-coulomb charge through a potential difference of 1.5 V is
A.
0.695 J
B.
6.2 J
C.
10 J
D.
90 J
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ANSWER :
D. 90 J