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 Afternoon Shift
MCQ (Single Correct Answer)
+1
-0

An electric motor raises a mass of $$1.5 \mathrm{~kg}$$, a distance of $$1.128 \mathrm{~m}$$ in time of $$4.79 \mathrm{~s}$$. Calculate the power to an appropriate significant figures. (take $$g=9.81 \mathrm{~ms}^{-2}$$)

A
3.465 W
B
3.47 W
C
3.46 W
D
3.5 W
4
COMEDK 2024 Afternoon Shift
MCQ (Single Correct Answer)
+1
-0

An object of mass $$3 \mathrm{~kg}$$ moves due to an applied constant force such that its position along $$\mathrm{X}$$ axis is given by $$x=\frac{t^3}{3}$$ where $$x$$ is in meters and $t$ in seconds. The work done in 1 second is

A
2 J
B
$$\frac{2}{3}$$ J
C
1 J
D
6 J
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