Question Paper
Class / Subject: Class 9 (ICSE) · Physics
Chapter: Chapter 5 — Chapter 5: Upthrust in Fluids, Archimedes' Principle and Floatation
Time Allowed: 32 minutes
Max Marks: 16
1. What does Archimedes' Principle state? [1]
(A) Upthrust equals weight of displaced fluid
(B) Upthrust equals the object's weight always
(C) Upthrust has no relationship to fluid
(D) Objects always sink regardless of upthrust
2. When does an object float? [1]
(A) When weight is less than or equal to maximum upthrust
(B) When weight always exceeds upthrust
(C) Only in water, never other fluids
(D) Objects never float
3. When does an object sink? [1]
(A) When weight exceeds upthrust
(B) When weight equals upthrust always
(C) When density is less than the fluid
(D) Objects never sink
4. What determines floatation besides weight? [1]
(A) Density
(B) Only colour
(C) Only size
(D) Only shape, unrelated to density
5. What happens if an object is less dense than the fluid? [1]
(A) It floats
(B) It sinks
(C) It disappears
(D) Nothing happens
6. What happens if an object is denser than the fluid? [1]
(A) It sinks
(B) It floats
(C) It disappears
(D) Nothing happens
7. Why do heavy ships float? [1]
(A) They displace enough water to create sufficient upthrust
(B) They are lightweight, contrary to appearance
(C) Ships don't actually float
(D) No specific reason
8. Why study upthrust and floatation? [1]
(A) To understand and design floating vessels
(B) No reason
(C) It's not useful
(D) Only for tests
9. What does Archimedes' Principle state? [1]
(A) Upthrust equals weight of displaced fluid
(B) Upthrust equals the object's weight always
(C) Upthrust has no relationship to fluid
(D) Objects always sink regardless of upthrust
10. When does an object float? [1]
(A) When weight is less than or equal to maximum upthrust
(B) When weight always exceeds upthrust
(C) Only in water, never other fluids
(D) Objects never float
11. When does an object sink? [1]
(A) When weight exceeds upthrust
(B) When weight equals upthrust always
(C) When density is less than the fluid
(D) Objects never sink
12. What determines floatation besides weight? [1]
(A) Density
(B) Only colour
(C) Only size
(D) Only shape, unrelated to density
13. What happens if an object is less dense than the fluid? [1]
(A) It floats
(B) It sinks
(C) It disappears
(D) Nothing happens
14. What happens if an object is denser than the fluid? [1]
(A) It sinks
(B) It floats
(C) It disappears
(D) Nothing happens
15. Why do heavy ships float? [1]
(A) They displace enough water to create sufficient upthrust
(B) They are lightweight, contrary to appearance
(C) Ships don't actually float
(D) No specific reason
16. Why study upthrust and floatation? [1]
(A) To understand and design floating vessels
(B) No reason
(C) It's not useful
(D) Only for tests