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Free download in PDF CBSE class 7 Science Objective Type Questions with Answers. Here Gkseries provide Science Solve Questions and Answers for CBSE class 7 Students.
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
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
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
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
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
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
131
Which of the following does not use magnetic effect of electric current?
[A]
electric fan
[B]
electric bulb
[C]
electric motor
[D]
refrigerator
132
Which of the following acts as safety device in electric appliances?
[A]
fuse
[B]
connecting wires
[C]
resistors
[D]
battery
133
Which of the following is an essential element in an electric circuit?
[A]
switch
[B]
connecting wires
[C]
voltmeter
[D]
ammeter
134
When an electric current passes through a solenoid, it acts as a/an
[A]
insulator
[B]
electric bell
[C]
resistor
[D]
bar magnet
135
The device used to make or break an electric circuit is:
[A]
Switch
[B]
Ammeter
[C]
Resistor
[D]
Battery
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
137
Which type of mirror is used in Periscope?
[A]
convex mirror
[B]
concave mirror
[C]
plane mirror
[D]
none of these
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°
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
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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