Physics Questions and Answers
If you want to learn more about the nature and properties of matter and energy or you're simply preparing for a Physics exam, these Physics past questions and answers are ideal for you.
If you want to learn more about the nature and properties of matter and energy or you're simply preparing for a Physics exam, these Physics past questions and answers are ideal for you.
0.8N
2.5N
0.5N
1.0N
Correct answer is C
Upthrust = change in weight
density = massvolume
Mass of liquid displaced = Density of Liquid × Volume;
= 103×50×10−6m3
= 0.05kg
(Note that the volume of 50cm3 was converted to m3 by multiplying by 106) i.e 50cm3=50×10−6m3
Since mass displaced = 0.05kg
Upthrust = mg = 0.05 × 10
= 0.5N
Why do soldiers march disorderly while crossing a bridge?
To prevent resonance on the bridge
To set the bridge into resonance
To make the b ridge collapse
To spread their weight evenly on the bridge
Correct answer is A
Soldiers march disorderly while crossing a bridge to prevent resonance because when soldiers march in orderly manner across a bridge, they generate a rhythmic oscillation of wave on the bridge and at a certain point, would start oscillation to the same rhythm as that of the marching steps. This oscillation would reach a maximum peak when the bridge can no longer sustain its own strength and hence collapses. So for this reasons, soldier are ordered to march disorderly while crossing a bridge.
Which is the incorrect formula for a body accelerating uniformly?
a = v2 − u22
v2 = u2 + 2as
s = ut + 12 at2
v2 − u2= 2as
Correct answer is A
Look through the equations of motion
Δx . Δp = h
Δx . Δp ≤ = h
Δx . Δp ≥ = h
Δx . Δp > h
Correct answer is C
No explanation has been provided for this answer.