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.