physics

A wire of cross-sectional area 0.60mm2 has a resistivity of 7.2 x 10-7 Ω. Calculate the length of wire that will have a resistance of 3Ω.

A. 0.25m B. 2.50m C. 3.60m D. 36.00 Correct Answer: Option B B. 2.50m Explanation R = P/LA C =…

6 years ago

The symbol illustrated above is that of a resistor?

A. which absorb light B. which emits light C. which absorbs heat to function properly D. whose resistance is light-dependent…

6 years ago

Which of the following statements about a three-pin plug is/are correct?

i. The brown wire is the live wire. ii. The fuse is connected to the live wire. iii. The earth…

6 years ago

Which of the following statements is correct? When capacitors of different values are connected in series?

A. the same charge flows through them B. the same voltage appears across each capacitor C. different quantities of charges…

6 years ago

An electric generate rated 12kw, 2kv distribute power through a capable of resistance 20Ω. Calculate the power loss in the cable.

A. 120 w B. 360 w C. 720 w D. 2400 w Correct Answer: Option A A. 120 w Explanation…

6 years ago

The diagram given illustrates two charged particles W and X. The charges on W and x are respectively?

A. negative; negative B. negative; positive C. positive; positive D. positive; negative Correct Answer: Option A A. negative; negative

6 years ago

All electromagnetic waves in a vacuum have the same?

A. wavelength B. frequency C. speed D. amplitude Correct Answer: Option C C. speed

6 years ago

An object is placed 20cm from a concave mirror of focal length 15cm. Calculate the linear magnification of the image formed?

A. 0.5 B. 1.5 C. 2.0 D. 3.0 Correct Answer: Option D D. 3.0 Using lens formula

6 years ago

Red light travels faster than blue light when both of them pass through a glass prism because the?

A. refractive index of red light is greater than that of blue light B. refractive index of blue light is…

6 years ago