CBSE Class 10 Science Sample Paper 2018 Set L

Section A

1. A ray of light AM is incident on a spherical mirror as shown in the diagram.

Redraw the diagram on the answer sheet and show the path of reflected ray.

1. A metal M belongs to 13th group in the modern periodic table. Write the valency of the metal.

2. The ciliary muscles of a normal eye are in their (i) most relaxed (ii) most contracted state. In which of the two cases is the focal length of the eye-lens more?

3. Tap water conducts electricity whereas distilled water does not. Why?

4. An electric geyser has the ratings 2000W, 220V marked on it. What should be the minimum rating, in whole number of a fuse wire, that may be required for safe use with this geyser?

5. Kerosene burns with a sooty flame. Is it a saturated or an un saturated compound?

6. Two metallic wires A and B of the same material are connected in parallel. Wire A has length l and radius r, wire B has a length 2l and radius 2r. Calculate the ratio of the equivalent resistance in parallel combination and the resistance of wire A.

7. A student performs an experiment to study the magnetic effect of current around a current carrying straight conductor. He reports that

(i) for a given battery, the degree of deflection of a N – pole decreases when the compass is kept at a point farther away from the conductor.

(ii) the direction of deflection of the north pole of a compass needle kept at a given point near the conductor remains unaffected even when the terminals of the same battery sending current in the wire are inter changed. Which of the above observations of the student appears to be wrong and why?

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