1
Creation of something from nothing is against the law of
A)
constant proportions
B)
conservation of mass-energy
C)
multiple proportions
D)
conservation of momentum
Answer & Solution
Answer: Option
B
2
In the force equation F is equal to-
A)
ma
B)
mgh
C)
mv
D)
u + at
Answer & Solution
Answer: Option
A
3
The SI unit of mechanical energy is
A)
joule
B)
watt
C)
newton-second
D)
joule-second
Answer & Solution
Answer: Option
A
4
The force of gravity acting on an object is known as . . . . . . . .
A)
mass
B)
acceleration
C)
impulse
D)
weight
Answer & Solution
Answer: Option
D
5
An object of 5.0 kg is raised to a height of 2 m, in this process, how much work was done- (g = 9.8m/s2 )
A)
49 joule
B)
10 joule
C)
19.6 joule
D)
98 joule
Answer & Solution
Answer: Option
D
6
900 × 106 J of energy is consumed in a month in a house. How much this energy is in the unit?
A)
25
B)
2.5
C)
2500
D)
250
Answer & Solution
Answer: Option
D
7
The kinetic energy of a moving object depends on-
A)
Weight and its location
B)
Mass and its location
C)
Mass and momentum
D)
Mass and velocity
Answer & Solution
Answer: Option
D
8
The weight of an object is 980 N. If the gravitational acceleration is 9.8 ms-2 , find the mass of the object-
A)
100 kg
B)
8.8 kg
C)
10 kg
D)
1 kg
Answer & Solution
Answer: Option
A
9
Match the columns.
Column I Column II
a. In an electric heater
1. Chemical energy is converted into heat energy
b. In an electric bulb
2. heat energy is converted into mechanical energy
c. In burning of coal
3. Electrical energy is converted into light energy
d. In steam engine
4. Electrical energy is converted into heat energy
A)
a-4, b-3, c-1, d-2
B)
a-3, b-4, c-1, d-2
C)
a-1, b-2, c-3, d-4
D)
a-4, b-3, c-2, d-1
Answer & Solution
Answer: Option
A
10
A cricket ball of mass 100g moving with a velocity of 30 m/s is stopped by a player in 0.05 seconds. The average force exerted by the player is-
A)
15 N
B)
40 N
C)
-60 N
D)
60 N
Answer & Solution
Answer: Option
C
