MCQ & Extra Questions: Motion & Measurement of Distances | Science Class 6 PDF Download

Extra Questions

Q1: Define rest and motion.
Ans: An object that does not change its position with time is said to be at rest. An object that changes its position with time is said to be in motion.

Q2: Give two examples of linear motion.
Ans: (a) Motion of a bike on a straight road.
(b) An athlete running on a straight track.

Q3: What is circular motion? Give example.
Ans: When an object moves in a circular path, such motion is called circular motion.
For example- The motion of a point marked on the blade of an electric fan is a circular motion.

Q4: What is periodic motion? Give example.
Ans: An object repeats its motion after some time; this type of motion is called periodic motion.
For example- The motion of a pendulum is a periodic motion.

Q5: What is the difference between rectilinear and circular motion?
Ans: When objects move along a straight line such motion is called rectilinear motion. Whereas when an object moves in a circular path, such motion is called circular motion.

Q6: How can the thickness of a coin be measured?
Ans: Take ten coins and put them one above the other. Measure the thickness of the coins with a scale and divide the total thickness with the number of coins. 

Q7: While travelling in a train, it appears that the trees near the track are moving whereas co-passengers appear to be stationary. Explain the reason.
Ans: When we see the trees from a moving train, their position changes with respect to us. Hence, they appear to be moving. On the other hand, the position of co-passengers is not changing with respect to us, hence they appear to be stationary. 

Q8: Differentiate between distance and displacement.
Ans: Distance: The total length travelled from one point to another.
Displacement: It is the shortest distance travelled from one point to another.

Q9: Can you measure the length of a pencil with a metre scale?
Ans: No, the length of a pencil cannot be measured with a metre scale. To measure the length of a pencil, a small scale, like a inch plastic scale should be used. This length should be expressed in centimetres.

Q10: Which unit should be used to express thickness of coin or wire?
Ans: Very small length like thickness of coin or wire is expressed in millimetres (mm).
1 mm = 10^-3 m or 10³ mm = 1 m.

Multiple Choice Questions

Q1: The standard unit of length in SI system is
(a) Foot
(b) Yard
(c) Centimeter
(d) Metre
Ans: (d)
Sol: The standard unit of length in SI system is metre.

Q2: What device should a tailor use to measure the length of cloth?
(a) Measuring tape
(b) Scale
(c) String
(d) Measuring rod
Ans: (a)
Sol: Measuring tape is used by a tailor to measure the length of cloth.

Q3: One cm is equal to
(a) 1 km
(b) 1 m
(c) 10 mm
(d) 1000 m
Ans: (c)
Sol: One centimetre (cm) is equal to: 10 mm

Q4: The movement of earth around the sun is an example of
(a) Oscillatory motion
(b) Non-Periodic Motion
(c) Translatory motion
(d) Periodic motion
Ans: (d)
Sol: Oscillatory motion takes place when the restoring force acting on the body is directly proportional to its displacement from its equilibrium position. In practice, oscillatory motion eventually comes to rest due to damping or frictional forces.
Non-periodic motion: The motion which does not repeat itself after a regular interval of time is called non-periodic motion. Examples: A footballer running on a field, application of brakes in a moving vehicle, a ball rolling the ground gradually slows down finally stops, the motion of tides in the sea, etc.
A type of motion in which all parts of the body move the same distance in a given time is known as translatory motion. Translatory motion can be of two types: rectilinear and curvilinear.
The movements of the earth around the sun are an example of periodic motion as it is completed in a fixed interval of time.

Q5: The distance between Delhi and Kanpur is usually expressed in
(a) Metre
(b) Hectometer
(c) Kilometer
(d) Centimeter
Ans: (c)
Sol: The distance between Delhi and Kanpur is usually expressed in kilometre.

Q6: Which of the following does not represent a time-interval?
(a) Time of sunrise
(b) A minute
(c) A day
(d) A second
Ans: (a)
Sol: Time of sunrise is a point of time while a day, a minute and a second represent a period of time or time interval.

Q7: One kilometer is equal to
(a) 1000 m
(b) 100 m
(c) 10 m
(d) 1000 cm
Ans: (a)
Sol: One kilometre is equal to 1000 meter.

Q8: Hectare is the unit of
(a) Volume
(b) Length
(c) Area
(d) Mass
Ans: (c)
Sol: Hectare is the unit of area which is equal to 10000 meter square.

Q9: Which one is not a/an ancient unit of measurement?
(a) Angul
(b) Meter
(c) Cubit
(d) Girah
Ans: (b)
Sol: Girah, Cubit and Angul are ancient unit of measurement while meter is SI unit of measurement.

Q10: Change in position of a body with time is called
(a) Displacement
(b) Motion
(c) Speed
(d) Distance
Ans: (b)
Sol: Motion refers to the change in position of a body with respect to time. It is a general term that encompasses various aspects, such as displacement (change in position), speed (rate of change in position), and distance (total path traveled).