GROUP 1
Q1) A student hangs an object on a spring balance. The spring stretches twice as much as before. What can be concluded?
A. The object's mass has doubled.
B. The object exerts a greater weight.
C. Gravity has increased.
D. The spring has become longer permanently.
B. The object exerts a greater weight.
Q1) Which statement about a spring balance is correct?
A. It measures the amount of matter in an object.
B. It measures the force acting on an object.
C. It compares masses.
D. It measures volume.
B. It measures the force acting on an object.
Q1) A spring balance has its pointer not exactly at zero before use. What is most likely to happen?
A. Reading becomes more accurate.
B. Weight remains unaffected.
C. The measured weight may be incorrect.
D. Only heavy objects are affected.
C. The measured weight may be incorrect.
Q1) A spring balance is held horizontally while measuring an object.
Which is the best conclusion?
A. Reading remains correct.
B. Reading may not be accurate.
C. Weight becomes mass.
D. Spring stretches more.
B. Reading may not be accurate.
Q2) Two spring balances are available.
Which is better for measuring the weight of an eraser?
A. Balance A
B. Balance B
C. Both are equally suitable
D. Neither
B. Balance B
Q2) A student measures the weight of an object while it is swinging continuously.
Which statement is correct?
A. Reading remains constant.
B. Reading may keep changing.
C. Reading becomes zero.
D. Reading becomes the mass.
B. Reading may keep changing.
Q2) The least count of a spring balance is 0.5 N.
Which weight cannot be measured accurately?
A. 5.0 N
B. 3.5 N
C. 4.5 N
D. 4.3 N
D. 4.3 N
Q2) Which observation best shows that a spring balance measures weight?
A. It always gives readings in kilograms.
B. The spring stretches due to Earth's pull.
C. It compares two objects.
D. It counts the amount of matter.
B. The spring stretches due to Earth's pull.
Q3) A student takes the same school bag to the Moon.
Which statement is correct?
A. Mass decreases and weight decreases.
B. Mass remains same but weight decreases.
C. Mass increases but weight remains same.
D. Both remain same.
B. Mass remains same but weight decreases.
Q3) Which pair is correctly matched?
Quantity Instrument
A. Mass → Spring Balance
B. Weight → Beam Balance
C. Mass → Beam Balance
D. Weight → Measuring Tape
C. Mass → Beam Balance
Q3) A student says,
"Weight is measured in kilograms because my weighing machine shows kilograms."
Which is the best scientific explanation?
A. The student is correct.
B. Kilogram is the SI unit of weight.
C. Kilogram measures mass; weight is actually a force.
D. Both kilogram and Newton measure weight.
C. Kilogram measures mass; weight is actually a force.
Q3) An astronaut carries a beam balance and a spring balance to another planet.
Which statement is correct?
A. Both instruments show different readings.
B. Beam balance reading remains the same, spring balance reading changes.
C. Spring balance reading remains the same, beam balance changes.
D. Neither instrument works.
B. Beam balance reading remains the same, spring balance reading changes.
4) A wooden block and an iron block have the same volume and are completely immersed in water.
Which statement is correct?
A. The wooden block experiences greater upthrust because it floats.
B. The iron block experiences greater upthrust because it is heavier.
C. Both experience the same upthrust because they displace equal volumes of water.
D. The iron block experiences no upthrust because it sinks.
C. Both experience the same upthrust because they displace equal volumes of water.
A plastic bottle floats on water. When it is filled completely with sand and placed in water, it sinks.
4) The bottle sinks because
A. the upthrust becomes zero.
B. its weight becomes greater than the upthrust.
C. water stops exerting force on the bottle.
D. sand attracts the bottle downward.
B. its weight becomes greater than the upthrust
4) Which of the following will experience the greatest upthrust?
A. A marble floating on water.
B. A steel ball completely immersed in water.
C. A hollow plastic ball completely immersed in water having the same volume as the steel ball.
D. Both B and C.
D. Both B and C.
4) A boat floats on a lake carrying passengers. Some passengers get down.
What happens?
A. The boat displaces more water.
B. The boat sinks deeper.
C. The boat rises because it now needs less upthrust.
D. The upthrust disappears.
C. The boat rises because it now needs less upthrust.
5) A block is floating in water.
Which one of the following is always true?
A. Weight < Upthrust
B. Weight > Upthrust
C. Weight = Upthrust
D. Upthrust = 0
C. Weight = Upthrust
5) A ship floats in seawater but sinks deeper in river water.
The best explanation is
A. River water exerts no upthrust.
B. Seawater is denser, so a smaller volume displaced provides the required upthrust.
C. River water is heavier than seawater.
D. The ship becomes heavier in river water.
B. Seawater is denser, so a smaller volume displaced provides the required upthrust.
5) A metal cube is tied to a wooden block. The combination is placed in water and floats.
Which statement is correct?
A. Only the wooden block experiences upthrust.
B. Only the metal cube experiences upthrust.
C. Both experience upthrust, and together it balances the total weight.
D. Upthrust acts only on floating objects.
C. Both experience upthrust, and together it balances the total weight
5) A student says,
"An object that sinks in water experiences no upthrust."
This statement is
A. Correct because only floating objects experience upthrust.
B. Incorrect because every object immersed in a fluid experiences upthrust.
C. Correct because sinking objects are heavier.
D. Incorrect because water pushes only on floating objects.
B. Incorrect because every object immersed in a fluid experiences upthrust.