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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.

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141.

A cell whose internal resistance is 0.55 $\Omega$ delivers a current of 4 A to an external resistor. The lost voltage of the cell is?

4.00 V

2.20 V

0.15 V

8.00 V

View answer & explanation

Correct answer is B

Lost voltage = I x R

= 4 x 0.55

= 2.2V

142.

Which of the following is not a consequence of hydrogen bubbles covering the copper plate of a primary cell?

formation of hydrogen bubbles on the electrode

increase in the resistance of the cell

local action

polarization

View answer & explanation

Correct answer is C

If the zinc used in the simple cell is of the impure commercial variety bubbles of hydrogen will be seen coming off the zinc. This is called local action

143.

The relationship between the coefficient of linear expansion $\alpha$ and volumetric expansion ( $\gamma$ ) is-----------------

$\gamma$ = $\alpha ^{-3}$

$\gamma$ = $\alpha$

3 $\alpha$

$\gamma$ = $\alpha ^{3}$

View answer & explanation

Correct answer is C

volumetric expansion (γ) = 3x Linear expansion

144.

A car starts from rest and covers a distance of 40 m in 10 s. Calculate the magnitude of its acceleration

3.20 ms $^{-2}$