Work and Energy Test

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Work and Energy Test - 34

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Weekly Quiz Competition

Question 1
1 / -0

The number of joules contained in $$1 kWh$$ is

A
$$36 \times {10}^{2}$$

B
$$36 \times {10}^{3}$$

C
$$36 \times {10}^{4}$$

D
$$3.6 \times {10}^{6}$$

Solution

1 KWh = 1000 $$\ast$$ joule/sec $$\ast$$ 60 $$\ast$$ 60 sec

1KWh = 1000 $$\ast$$ 60 $$\ast$$ 60joue/sec $$\ast$$ sec

1KWh = 1000 $$\ast$$ 60 $$\ast$$ 60 joule

1KWh = 36,00,000 joule = 3.6 $$\ast$$ 10$$^{6}$$
Question 2
1 / -0

A body at rest can have:

A
speed

B
energy

C
momentum

D
velocity

Solution
Question 3
1 / -0

A raised hammer possesses :

A
K.E.

B
P.E.

C
electrical energy

D
sound energy

Solution

A raised hammer possesses P.E
Energy possessed by a body by virtue of its position is called as potential energy. Similarly is the case when a hammer is raised. A raised hammer possesses potential energy by virtue of its height above ground level.
Question 4
1 / -0

An object of mass $$1 kg$$ has a P.E. of $$1 J$$ relative to the ground when it is at a height of

A
$$0.1 m$$

B
$$1 m$$

C
$$9.8 m$$

D
$$32 m$$

Solution

$$P.E$$ is given by $$=mgh$$
where $$h$$ is the height, $$m$$ is mass and $$g$$ is acceleration due to gravity
$$1J=1\times 10\times h\\ \\ $$
$$h=0.1m$$
Question 5
1 / -0

1 $$hp$$ is equal to:

A
$$0.746kW$$

B
$$7.46 kW$$

C
$$74.6kW$$

D
$$746 kW$$

Solution

The horsepower (hp) is a unit in the foot-pound-second ( fps ) or English system, sometimes used to express the rate at which mechanical energy is expended.A power level of 1 hp is approximately equivalent to $$746$$ $$watt(W)$$ or $$0.746$$ $$kilowatt(kW)$$.
Question 6
1 / -0

Mechanical work done is equal to (symbol have their usual meanings)

A
$$W=\frac { F }{ S } $$

B
$$W=FS$$

C
$$W=F+S$$

D
$$W=F-S$$

Solution

Work done is defined as product of the force and the distance over which the force is applied.
Question 7
1 / -0

The mass of an object $$P$$ is double the mass of $$Q$$. If both move with the same velocity, then the ratio of K.E. of $$P$$ to $$Q$$ is

A
1 : 2

B
2 : 1

C
1 : 4

D
4 : 1

Solution

$$ M_P =2 \times M_Q$$
$$ V_P = V_Q $$

$$ K.E_P: K.E_Q = ?$$

$$\implies \dfrac{1}{2}M_PV_P^2 : \dfrac{1}{2}M_QV_Q^2 $$
Since $$V_P$$ =$$V_Q$$
$$\implies M_P : M_Q $$
$$\implies 2 \times M_Q : M_Q $$
$$\implies 2 : 1 $$
Question 8
1 / -0

Work done upon a body is

A
a vector quantity

B
a scalar quantity

C
always positive

D
always negative

Solution

Work done due to displacement caused by a force is a scalar quantity, since it has only magnitude and no direction.
Question 9
1 / -0

A person walks $$100$$ m, holding a suitcase of weight $$100$$ N. The work done by the applied force is ____ J.

A
$$10000$$

B
$$100$$

C
zero

D
$$5000$$

Solution

In the given scenario, Direction of force on the suitcase is vertically upward and this force will make $$90^\circ $$ angle with displacement vector.
So there is no motion in the direction of force applied. So work done by girl on the suitcase will be zero.
Option C
Question 10
1 / -0

The product of force and displacement equals:

A
work

B
power

C
momentum

D
none of these

Solution

Work is defined as the dot product of force and displacememt.(F.S)
Power is defined as work done per unit time.(j/s)
Momentum is defined as mass into velocity(mv).
So best possible answer is option A.

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Re-Attempt Weekly Quiz Competition

Work and Energy Test - 34

Result

Work and Energy Test - 34

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SHARING IS CARING

Question 1

$$36 \times {10}^{2}$$

$$36 \times {10}^{3}$$

$$36 \times {10}^{4}$$

$$3.6 \times {10}^{6}$$

Solution

Question 2

speed

energy

momentum

velocity

Solution

Question 3

K.E.

P.E.

electrical energy

sound energy

Solution

Question 4

$$0.1 m$$

$$1 m$$

$$9.8 m$$

$$32 m$$

Solution

Question 5

$$0.746kW$$

$$7.46 kW$$

$$74.6kW$$

$$746 kW$$

Solution

Question 6

$$W=\frac { F }{ S } $$

$$W=FS$$

$$W=F+S$$

$$W=F-S$$

Solution

Question 7

1 : 2

2 : 1

1 : 4

4 : 1

Solution

Question 8

a vector quantity

a scalar quantity

always positive

always negative

Solution

Question 9

$$10000$$

$$100$$

zero

$$5000$$

Solution

Question 10

work

power

momentum

none of these

Solution

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