Engineering :: Applied Mechanics
221.
If a gymnast sitting on a rotating stool, with his arms outstretched suddenly lowers his arm
A.
the angular velocity will decrease
B.
his moment of inertia will decrease
C.
the angular velocity will remain constant
D.
the angular momentum will increase
Answer: Option B
Explanation:
222.
What will be the duration of day and night if the earth shrinks to half the present radius?
A.
24 hours
B.
12 hours
C.
6 hours
D.
3 hours
Answer: Option C
Explanation:
223.
A particle of mass M moves towards right with a velocity 2 V along the x-axis and another of mass 2 M with a velocity V towards left (- x axis). After the collision (they stick together on colliging) they will
A.
come to rest
B.
move towards left
C.
move towards right
D.
may move in any direction
Answer: Option C
Explanation:
224.
A imaginary planet has half the mass and half the radius of the earth. The acceleration of gravity at its surface would be
A.
9.8 m/s2
B.
4.9 m/s2
C.
19.6 m/s2
D.
2.45 m/s2
Answer: Option C
Explanation:
225.
The excape velocity for the moon is nearly
A.
11.2 km/s
B.
5 km/s
C.
2.4 km/s
D.
1.1 km/s
Answer: Option C
Explanation:
226.
If a solid sphere rolls on a horizontal surface, then the ratio of its rotational kinetic energy to its total kinetic energy is
Answer: Option B
Explanation:
227.
According to principle of transmissiblity of forces, when a force acts upon a body, its effect is
A.
minimum when it acts at C.G. of the body
B.
maximum when it acts at C.G. of the body
C.
different at different points of the body
D.
same at every point in its line of action
Answer: Option D
Explanation:
228.
Secondary stresses may be set up in frame due to any of the following reasons EXCEPT :
A.
rigidity of the members
B.
eccentricity of connections
C.
self-weight of the members
D.
members not being straight
Answer: Option A
Explanation:
229.
The common acceleration will be
A.
1.0 m/s2
B.
1.5 m/s2
C.
3 m/s2
D.
6 m/s2
Answer: Option A
Explanation:
230.
The tension T1 will be
Answer: Option B
Explanation:
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