Category: Everyday Science MCQs

The speed of light in vacuum is about:

(A) 300 million meters per second
(B) 300 million meters per hour
(C) 300 million kilometers per second
(D) 300 million kilometers per hour

Q. The speed of light in vacuum is a universal physical constant, commonly denoted by:
(A) s
(B) d
(C) c
(D) l

Q. Sunlight takes about _______ to travel the average distance from the surface of the sun to the Earth. 
(A) 5 min 17 sec
(B) 6 min 17 sec
(C) 7 min 17 sec
(D) 8 min 17 sec

Answers:
1. (A) 300 million meters per second
2. (C) c
3. (D) 8 min 17 sec

The speed of sound in dry air at 20 °C is about:

(A) 130 m/s
(B) 230 m/s
(C) 330 m/s
(D) None of these

Q. In an exceptionally stiff material such as diamond, the speed of sound is:
(A) 12,000 m/s
(B) 10,000 m/s
(C) 8,000 m/s
(D) 6,000 m/s

Q. The ratio of the speed of an object to the speed of sound in the fluid is called object’s:
(A) Travelling speed
(B) Mach Number
(C) Effects on speed
(D) None of these

Answers:
1. (D) None of these (343 m/s)
2. (A) 12,000 m/s
3. (B) Mach Number

When sound is reflected from floor, ceiling or a wall, it mixes with the original sound and changes its complexion, it is called as:

(A) Sound
(B) Echo
(C) Reverberation
(D) Noise

Q. The process of reducing the level of reverberation in a sound or signal is:
(A) Dereverberation
(B) Antireverberation
(C) Unreverberation
(D) None of these

Q. A reflection of sound that arrives at the listeners with a delay after the direct sound is called:
(A) Noise
(B) Echo
(C) Reverberation
(D) None of these

Answers:
1. (C) Reverberation
2. (A) Dereverberation
3. (B) Echo

The magnet always points in the same direction, if allowed to move freely i.e. towards North and South poles, because of:

(A) Gravitational field
(B) A lot of metal deposits on North and South Poles
(C) Due to attraction of North Pole and repulsion of Western Pole
(D) Earth is a huge magnet

Q. Materials that can be magnetized which are also the ones that are strongly attracted to a magnet are called:
(A) Ferromagnetic
(B) Magnetized
(C) Electromagnetic
(D) None of these

Q. A vector that characterizes the magnet’s overall magnetic properties is called:
(A) Magnetic field
(B) Magnetic Moment
(C) Polarity
(D) None of these

Answers:
1. (D) Earth is a huge magnet
2. (A) Ferromagnetic
3. (B) Magnetic Moment

The unit of home electricity energy consumption is:

(A) Watt hour
(B) Kilowatt hour
(C) Joule hour
(D) Kilojoule hour

Q. The Kilowatt hour is a unit of energy equal to ______ megajoules. 
(A) 3.6
(B) 4.6
(C) 5.6
(D) 6.6

Q. The derived unit of energy within the International System of Units (SI) is:
(A) watt
(B) joule
(C) kilojoule
(D) None of these

Answers:
1. (B) Kilowatt hour
2. (A) 3.6
3. (B) joule