CBSE class 7 Science Quiz | CBSE class 7 Science Objective Type Questions with Answers

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Questions
121 The motion that repeats itself after regular intervals of time can be ___ (Find the incorrect option).
A To and Fro Motion
B Circular Motion
C Rectilinear Motion
D Periodic Motion

Answer: Rectilinear Motion
122 If the an object moving along a straight line, keeps changing its speed then,
A The motion is said to be a uniform motion
B The motion is said to be a non uniform motion
C The object is said to be stationary
D The motion is said to be a fast motion

Answer: The motion is said to be a non uniform motion
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123 36 km/hr can also be expressed as:
A 10 m/s
B 3.6 m/s
C 100 m/s
D 36 m/s

Answer: 10 m/s
124 A faster moving object covers:
A More distance in shorter time
B Less distance in shorter time
C Less distance in more time
D More distance in more time

Answer: More distance in shorter time
125 The basic unit of speed is:
A m/s
B km/h
C km/min
D m/min

Answer: m/s
126 Which of the following instrument measures time with the most accuracy?
A mechanical clock with gears
B quartz clock
C sun dial
D sand clock

Answer: quartz clock
127 Compact fluorescent lamps (CFLs) are considered better than ordinary electric bulbs because?
A CFLs reduce wastage
B CFLs can be fixed in the ordinary bulb holders.
C both (a) and (b)
D none of the above

Answer: both (a) and (b)
128 Which of the following is the best option while considering the safety of household electric appliances?
A We should use wire strip as fuses.
B We should use non-ISI marked MCBs
C We should use ISI marked MCBs
D We should use conductors with high melting point in fuses.

Answer: We should use ISI marked MCBs
129 The strength of the magnetic field due to a solenoid can be increased by
A decreasing the current strength in the solenoid
B increasing the number of turns in the solenoid
C by winding solenoid around a plastic rod
D all of the above

Answer: increasing the number of turns in the solenoid
130 The magnetic effect of the current was discovered by ________?
A Oersted
B Ohm
C Newton
D Joule

Answer: Oersted
131 Which of the following does not use magnetic effect of electric current?
A electric fan
B electric bulb
C electric motor
D refrigerator

Answer: electric bulb
132 Which of the following acts as safety device in electric appliances?
A fuse
B connecting wires
C resistors
D battery

Answer: fuse
133 Which of the following is an essential element in an electric circuit?
A switch
B connecting wires
C voltmeter
D ammeter

Answer: connecting wires
134 When an electric current passes through a solenoid, it acts as a/an
A insulator
B electric bell
C resistor
D bar magnet

Answer: bar magnet
135 The device used to make or break an electric circuit is:
A Switch
B Ammeter
C Resistor
D Battery

Answer: Switch
136 Primary colours (as per modern colorimetry) consists of
A Cyan, Magenta, Yellow
B Red, Green, Blue
C Black, Yellow, White
D Red, Yellow, Blue

Answer: Red, Green, Blue
137 Which type of mirror is used in Periscope?
A convex mirror
B concave mirror
C plane mirror
D none of these

Answer: plane mirror
138 angle of incidence of ray of light on a plane mirror is 30°, then angle of reflection is _____.
A 30°
B 45°
C 60°
D 90°

Answer: 30°
139 Which lens always gives an image which is upright, virtual and smaller than the object?
A concave lens
B convex lens
C both concave and convex lens
D none of these

Answer: concave lens
140 Which of the following is NOT the other name of convex mirror?
A diverging mirror
B fish eye mirror
C converging mirror
D all of these

Answer: converging mirror

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