If the radius of the earth is 6.4 x 106m; the escape velocity of a satellite from the earth is? [g = 10 ms−²]
A. 1.13 x 104 ms-1 B. 9.00 x 103 ms-1 C. 8.00 x 103 ms-1 D. 1.27 x 104 ms-1 Correct Answer: Option A = 1.13 x 104 ms-1 Explanation Vesc = √2Rg. =√2 x 6.4 x 106 x 10 = 1.13 x 104 ms-1
In an experiment to determine terminal velocity; as the pressure increases; the viscosity of a liquid?
A. increases B. decreases C. increases then decrease D. remains constant Correct Answer: Option D = remains constant
The motion of smoke particles from a chimney is typical of?
A. random motion B. circular motion C. rotational motion D. oscillatory motion Correct Answer: Option A – random motion
An ammeter of resistance 5Ω has a full-scale deflection when a current of 50 mA flows in it. The value of the resistor required to adapt it to measure a current of 5 A is?
A. 0.25Ω B. 5.00Ω C. 19.80Ω D. 0.05Ω Correct Answer: Option D = 0.05Ω Explanation R = (igrg)/I-ig = (50 x 10-3 x 5)/5-(50 x 10-3) = (0.25)/4.95 = 0.0505 = 0.05Ω
When a certain a.c supply is connected to a lamp; it lights with the same brightness as it does with a 12 V d.c battery. Then r.m.s value of the a.c supply is?
A. 12.0 V B. 3.5 V C. 17.0 V D. 8.5 Correct Answer: Option A = 12.0 V Explanation The r.m.s value of an a.c voltage/current is the value of the d.c. voltage/ current that will dissipate the same amount of energy in a given resistance as the a.c. Thus the r.m.s value...Products
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