物理 2003 年 DSE、CE 選擇題（第 2 頁）

11.

A child is sitting on a chair as shown above. Which of the following pairs of forces is/are (an) action and reaction pair(s) ?

(1)The gravitational force exerted by the earth on the child. and The normal reaction exerted by the chair on the child.

(2)The force exerted by the child on the chair. and The normal reaction exerted by the chair on the child.

(3)The force exerted by the chair on the ground. and The gravitational force exerted by the earth on the chair.

12.

Ray travelling vertically downward onto the slanted face of a right-angled glass prism

A ray of light travels in air and strikes a glass prism as shown above. Which of the following diagrams best shows the path of the ray ?

Four ray diagrams A to D through the glass prism

13.

Which of the following ray diagrams concerning the refraction of light ray by a converging lens is/are incorrect ? $F$ denotes the focus of the lens.

Three ray diagrams (1), (2), (3) for a convex lens

14.

Photograph of a student viewing a distant object through a hand-held convex lens

The photograph shows a student using a convex lens of focal length $20$ cm to view a distant object. Which of the following statements about the image formed is/are correct ?

(1)The image will be erect.

(2)The image will be diminished.

(3)The student must use a screen in order to see the image.

15.

If there is no heat flow between two bodies when in contact, then the two bodies must have the same

16.

The difference in absolute temperature of two bodies is $100$ K. Express the temperature difference in degree Celsius.

17.

Figure (a): beaker of liquid with immersion heater on an electronic balance; Figure (b): balance reading against time, constant m2 until t1 then decreasing to m1 at t2

As shown in Figure (a), some liquid in a beaker is heated by a $1000$ W immersion heater. Figure (b) shows the variation of the reading of the electronic balance with time $t$ . Which of the following statements about the liquid is incorrect ?

18.

A student uses an electric kettle to heat $0.5$ kg of water at $20^\circ\mathrm{C}$ . The water boils in $4$ minutes. Estimate the output power of the kettle. The specific heat capacity of water is $4200\ \mathrm{J\,kg^{-1}\,{}^\circ C^{-1}}$ .

19.

A tyre of a car is filled with air at a temperature of $20^\circ$ C and a pressure of $200$ kPa. After driving for some time, the temperature of the air inside the tyre increases to $30^\circ$ C and the capacity of the tyre increases by $1\%$ . Find the pressure inside the tyre.

20.

Syringe with piston containing gas connected by rubber tubing to a Bourdon gauge

The above apparatus is used to study the relation between the pressure and volume of a fixed mass of gas at constant temperature. Which of the following can improve the accuracy of the experiment ?