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.
A good electric cell should have the following except
A minimum of polarization effect
A long life
A cheap and safe electrolytes
Cost and dangerous of the cell
Correct answer is D
A good electric cell should proses the following
1. A long life of an electric cell,
2. A minimum of polarization effect
3. A cheap and safe electrolytes
Except D cost and dangerous of the electric cell
The dimension of universal gravitational constant is……….?
M^{–1}L^3 T^{–2}
ML3T2
ML3
MLT-2
Correct answer is A
f α (MM ÷g2)
F(GMM ÷ r2) [G – gravitational constant]
GMM = Fr2
G = F02 ÷ MM = m × aπr2 ÷ MM (f = ma)
= (m × m5-2 × r2) ÷ MM
= (Kg.m52 × m2) ÷ Kg.Kg
=1 ÷ kg.m3.52
The dimension mathematically representation have a quantities of M, L AND T
M (Mass) = kg, L (Length) = M, T (Time) second
G = kg-1 m2.52(Using dimension rule)
M-1.L3.T-2
∴ The universal gravitational constant (G) = M^{–1}L^3 T^{–2}
What is the S.I unit of relative density?
kg m-2
kg m2
kg cm3
has no S.I unit
Correct answer is D
Note: relative density has no S.I unit
∴ Relative density = weight of substance ÷ weight of equal volume of water
RD = w1 ÷ (w1 – w2) (no S. I unit)
If a projectile has maximum range of 36m, find the speed of projection (Take g = 9.8m/s2)
19m/s
2m/s
4m/s2
7m/s2
Correct answer is A
No explanation has been provided for this answer.