200volts
300volts
283volts
250volts
Correct answer is C
Vr.m.s = V0 ÷ V2, where Vr.m.s rep. to as voltage root –square mean, v = peak voltage
Vr.m.s = 200volt, v = ?
200 = V0 ÷ V2
V0 = 200v2
= 200 × 1.414
= 282.8 volts V0 = b &approx.; 283 volts
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) =\( M^{–1}L^3 T^{–2} \)
For a best result using temperature to achieve an accurate measurement, it is best to use
Mercury thermometer
gas thermometer
clinical thermometer
alcohol thermometer
Correct answer is B
Gas thermometers are considered best for use to achieve an accurate temperature than others, such as liquid in glass thermometers such as mercury, clinical and alcohol thermometer
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)