Biology Test 43

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Biology Test 43

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Weekly Quiz Competition

Question 1
4 / -1

The unit kg m²s^-2 is associated with

A
work

B
kinetic energy

C
potential energy

D
all of the these

Solution

The unit kg m²s^-2 is associated with energy. Work, KE, PE are kinds of energy.
Question 2
4 / -1

Asha lifts a doll from the floor and places it on a table. If the weight of the doll is known, what else does one need to know in order to calculate the work Asha has done on the doll?

A
The time required

B
Height of the table

C
Mass of the doll

D
Cost of the doll

Solution

Work is force x displacement. So we need the amount of force done and the amount of displacement of the body. Therefore, in this case, height of the table will be required for the calculation of work.
Question 3
4 / -1

One kilowatt approximately equals

A
1.30 hp

B
2.50 hp

C
1.56 hp

D
1.83 hp

Solution

1 kW = 1000 W

1 kW = 1000 x 0.00134102209 hp

1 kW = 1.34102209 hp
Question 4
4 / -1

The work done in lifting a 1 kg mass to a height of 9.8 m is about

A
1 J

B
9.8 J

C
(9.8)² J

D
1 / (9.8)² J

Solution

W = mgh = 1 x 9.8 x 9.8 = (9.8)²
Question 5
4 / -1

The acceleration due to gravity on moon is one-sixth that on earth. A high-jumper can jump 2 m on earth. What distance can he jump on the moon?

A
2 m

B
12 m

C
6 m

D
8 m

Solution

Since the Initial potential energies on both Earth and Moon will be same. So, by equating the energies, we get,

mgh = mg'h'

g x 2 = g/6 x h'

h' = 12 m
Question 6
4 / -1

Which of the following does not represent a simple machine?

A
Lever

B
Pulley

C
Gear

D
Steam engine

Solution

Steam engine does not represent a simple machine.
Question 7
4 / -1

Steam engine does not represent a simple machine.

A
3600 J

B
360 J

C
36 J

D
3.6 J

Solution

The kilowatt hour (symbol kWh, kW•h, or kW h) is a derived unit of energy and is equal to 3.6 megajoules,

i.e, 1 kWh = 3600000 Joules. So, 1 Watt hour will be = 1kWh/1000 = 3600 J
Question 8
4 / -1

The efficiency of a heat engine can never be

A
10%

B
20%

C
40%

D
100%

Solution

The efficiency of a heat engine can never be 100%.
Question 9
4 / -1

Which of the following magnitudes is expressed most accurately?

A
1.3 ×10^-1 m

B
1.3 ×10^-2 m

C
1.3000 ×10^-4 m

D
1.3000 ×10^-6 m

Solution

The result is expressed in maximum number of significant figures in the 4^th option, so this option is the answer.

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Biology Test 43

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Biology Test 43

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SHARING IS CARING

Question 1

work

kinetic energy

potential energy

all of the these

Solution

Question 2

The time required

Height of the table

Mass of the doll

Cost of the doll

Solution

Question 3

1.30 hp

2.50 hp

1.56 hp

1.83 hp

Solution

Question 4

1 J

9.8 J

(9.8)2 J

1 / (9.8)2 J

Solution

Question 5

2 m

12 m

6 m

8 m

Solution

Question 6

Lever

Pulley

Gear

Steam engine

Solution

Question 7

3600 J

360 J

36 J

3.6 J

Solution

Question 8

10%

20%

40%

100%

Solution

Question 9

1.3 ×10-1 m

1.3 ×10-2 m

1.3000 ×10-4 m

1.3000 ×10-6 m

Solution

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(9.8)² J

1 / (9.8)² J

1.3 ×10^-1 m

1.3 ×10^-2 m

1.3000 ×10^-4 m

1.3000 ×10^-6 m