1
COMEDK 2024 Evening Shift
MCQ (Single Correct Answer)
+1
-0

A scooter moves with a speed of $$7 \mathrm{~ms}^{-1}$$, on a straight road and is stopped by applying the brakes. Before stopping, the scooter travels $$10 \mathrm{~m}$$. If the weight of the scooter is $$\mathrm{W}$$, then the total resistance to the motion of the scooter will be

A
$$\frac{1}{2} W$$
B
$$\frac{1}{4} W$$
C
4W
D
2W
2
COMEDK 2024 Evening Shift
MCQ (Single Correct Answer)
+1
-0

When water falls from a height of $$80 \mathrm{~m}$$ at the rate of $$20 \mathrm{~kg} \mathrm{~s}^{-1}$$ to operate a turbine the losses due to frictional force are $$20 \%$$ of input energy. How much power is generated by the turbine?

A
12.8 KW
B
62.5 KW
C
25.6 KW
D
21.6 KW
3
COMEDK 2024 Morning Shift
MCQ (Single Correct Answer)
+1
-0

The power of a gun which fires 120 bullet per minute with a velocity $$120 \mathrm{~ms}^{-1}$$ is : (given the mass of each bullet is $$100 \mathrm{~g}$$)

A
86400 W
B
14.4 kW
C
1.44 kW
D
1220 W
4
COMEDK 2023 Morning Shift
MCQ (Single Correct Answer)
+1
-0

A particle is projected at an angle $$30^{\circ}$$ with horizontal having kinetic energy $$K$$. The kinetic energy of the particle at highest point is.

A
$$\frac{1}{2} K$$
B
$$\frac{3}{4} K$$
C
$$\frac{3}{8} K$$
D
$$\frac{5}{8} K$$
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