1
IIT-JEE 1980
MCQ (Single Correct Answer)
+3
-0.75
A ship of mass 3 $$ \times $$ 107 kg initially at rest, is pulled by a force of 5 $$ \times $$ 104 N through a distance of 3 m. Assuming that the resistance due to water is negligible, the speed of the ship is
A
1.5 m/s
B
60 m/s
C
0.1 m/s
D
5 m/s
2
IIT-JEE 1980
MCQ (Single Correct Answer)
+2
-0.5
Two masses of 1gm and 4 gm are moving with equal kinetic energies. The ratio of the magnitude of their linear momentum is
A
4 : 1
B
$$\sqrt 2 :1$$
C
$$1:2$$
D
1 : 16
3
IIT-JEE 1980
MCQ (Single Correct Answer)
+2
-0.5
If a machine is lubricated with oil
A
the mechanical advantage of the machine increases
B
the mechanical efficiency of the machine increases
C
both its mechanical advantage and efficiency increases
D
its efficiency increases, but its mechanical advantage decreases
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