A cork floats on water because its density is MCQ with Answer and Explanation

A cork floats on water because its density is
A. Zero
B. Greater than that of water
C. Equal to that of water
D. Less than that of water
Answer: Option D
Solution (By JKSSB Mock Tests)
Objects float if their density is less than the fluid. Cork density < water density, so it floats. Iron sinks because density > water. Ship made of iron floats due to shape displacing more water, average density less.

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Practice More Physics Questions

Question #1
C.V. Raman was awarded Nobel Prize for his work on
A. Raman effect
B. X-rays
C. Photoelectric effect
D. Nuclear fission

Correct Answer: Option A


Explanation:
Raman effect: inelastic scattering of light, 1928, Nobel 1930.

This question belongs to: Science Physics
Question #2
A machine gun fires n bullets per second, each of mass m with velocity v. The force on the gun is
A. nmv/t
B. ½ nmv
C. nmv
D. nmv²

Correct Answer: Option C


Explanation:
Force = rate of change of momentum = n × (mv) = nmv. This is average force required to hold gun.

This question belongs to: Science Physics
Question #3
EM wave: E and B fields are:
A. Perpendicular to each other and propagation
B. Parallel to propagation
C. Parallel
D. Random

Correct Answer: Option A


Explanation:
EM waves transverse: E ⊥ B ⊥ propagation direction. Derived from Maxwell's equations. Memory tip: 'EM wave: right-hand rule for E×B direction'. Wave property frequently tested in competitive modern physics sections.

This question belongs to: Science Physics