ICSE Question Bank

ICSE Guess > ICSE Papers > Question Bank > Class X > 2008 >Physics

Question 2

(b) In what way will the temperature of water at the bottom of a waterfall be different from the temperature at the top? Give a reason for your answer. [2]

(c) A radar sends a signal to an aeroplane at a distance 45 km away with a speed 3 x 10⁸ ms^-1. After how long is the signal received back from the aeroplane? . [2]

(d) Draw a ray diagram to illustrate the determination of the focal length of a convex lens using an auxiliary plane mirror. [2]

(e) What is meant by primary colours? Name the primary colours of light. [2]

Question 3

(a) (i) Sketch a graph to show the change in potential difference across the ends of an ohmic resistor and the current flowing in it. Label the axes of your graph.
(ii) What does the slope of the graph represent?

Question 3

(b) Draw a labelled diagram of the staircase wiring for a dual
control switch showing a bulb in the circuit. [2]

(c) The electrical gadgets used in a house such as bulbs, fans, heater, etc, are always connected in parallel, NOT in series. Give two reasons for connecting them in parallel.[2]

(d) An electrical heater is rated 4 kW, 220V. Find the cost of using this heater for 12 hours if one kWh of electrical energy costs Rs. 3.25. [2]

(e) State one point of similarity and one point of difference between an a.c. generator and a d.c. motor. [2]

Question 4

Two isosceles right-angled glass prisms are placed near each other as shown in the figure.

(a) Complete the path of the light ray entering the first isosceles right-angled glass prism till it emerges from the second identical prism. [2]

(b) A certain quantity of ice at 0oC is heated till it changes into steam at 100oC. Draw a time-temperature heating curve to represent it. Label the two phase changes in your graph.[2]

(c) What is meant by work function of a metal?[2]

(d) What is radioactivity?[2]

(e) Mention any two differences between nuclear energy and chemical energy.[2]