1,280 practice questions for CBSE Class 7 Science, organised by NCERT chapter (12 chapters). Every question includes a written explanation. Pick a chapter below, or try the samples first.
Assertion (A): A bus that takes longer than usual on its usual route has a greater average speed that day. Reason (R): For a fixed distance, a longer time means a smaller average speed.
ABoth A and R are true, and R is the correct explanation of A
BBoth A and R are true, but R is not the correct explanation of A
CA is true, but R is false
DA is false, but R is true
Show answer and explanation
Correct answer: D - A is false, but R is true
The assertion is false, because a longer time over the same route means the bus was slower, not faster. The reason is true and states the correct relationship between time and average speed for a fixed distance. So the reason is exactly what shows the assertion to be wrong.
Q2
medium
Which response to the physical changes of adolescence is the most sensible?
ALooking for medicines that will stop the changes
BFeeling ashamed and staying away from friends and family
CBelieving that the changes are some kind of punishment
DAccepting them as a normal stage and taking good care of one's health
Show answer and explanation
Correct answer: D - Accepting them as a normal stage and taking good care of one's health
Since the changes are normal and healthy, the sensible response is to accept them and look after cleanliness, food and sleep. Withdrawing from people only adds loneliness to a normal stage. Trying to stop a healthy change with medicines is harmful, and treating it as a punishment has no basis at all.
Q3
medium
Read these two statements about a room being warmed by a heater standing on the floor. (i) Air warmed by the heater rises towards the ceiling. (ii) Cooler air moves in near the floor to take its place. Which of these is correct?
ABoth (i) and (ii)
BOnly (i)
CNeither (i) nor (ii)
DOnly (ii)
Show answer and explanation
Correct answer: A - Both (i) and (ii)
Both statements describe the two halves of the same convection current. Warm air is lighter for its size and climbs, and the cooler air near the floor slides in to replace it, only to be heated and rise as well. Rejecting either statement would break the circulation that actually warms the room.
Q4
easy
In most people, adolescence covers roughly the years from
Aabout 10 to about 19 years of age
Babout 25 to about 40 years of age
Cabout 1 to about 5 years of age
Dabout 45 to about 60 years of age
Show answer and explanation
Correct answer: A - about 10 to about 19 years of age
Adolescence spans the second decade of life, beginning around the age of ten and continuing through the teenage years. The age range of one to five years belongs to early childhood, while the ranges of twenty-five to forty and forty-five to sixty fall well within adulthood.
Q5
medium
Which of these questions can never be settled by a scientific test?
AWhether a heavier ball rolls further down a given slope
BHow long a pendulum takes to complete ten swings
CWhich colour is the nicest to look at
DWhether a given solution turns blue litmus red
Show answer and explanation
Correct answer: C - Which colour is the nicest to look at
Which colour is nicest is a matter of personal liking, and no measurement can decide it for everyone. The litmus question is answered by dipping the paper and looking. The rolling question is answered by releasing balls on the same slope and measuring. The pendulum question is answered with a stopwatch, so all three can be tested.
Q6
medium
Assertion (A): A person standing beside a bonfire can feel its heat on the exposed skin. Reason (R): Air is a poor conductor of heat.
ABoth A and R are true, and R is the correct explanation of A
BBoth A and R are true, but R is not the correct explanation of A
CA is true, but R is false
DA is false, but R is true
Show answer and explanation
Correct answer: B - Both A and R are true, but R is not the correct explanation of A
Both statements are true on their own. The warmth is felt because the fire sends out radiation, which crosses the gap in straight lines. That air conducts heat poorly is a fact, but it explains why conduction is not the route rather than why the warmth is felt, so R does not explain A.
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