Question

1. A concave mirror gives virtual, refracts and enlarged image of the object but image of smaller

size than the size of the object is

a. At infinity b. Between F and C c. Between P and F d. At E

2. The radius of curvature of a mirror is 20cm the focal length is

a. 20cm b. 10cm c. 40cm d. 5cm

3. A 10 mm long awl pin is placed vertically in front of a concave mirror. A 5 mm long image of the awl

pin is formed at 30 cm in front of the mirror. The focal length of this mirror is

a. – 30 cm b. – 20 cm c. – 40 cm d. – 60 cm.

4. Which of the following is a semiconductor?

a. Germanium b. Diamond c.Graphite d. Nichrome

5. If 5 equal pieces are made from a wire having resistance 5 Ω and then each piece is connected in

parallel to others, then their equivalent resistance will be...

a.1/5 Ω b. 1 Ω c. 5 Ω d. 25Ω

6. Where should an object be placed in front of a convex lens to get a real image of the same size of the

object ?

a. At the principal focus of the lens b. At twice the focal length

c. At infi nity d. Between the optical centre of the lens and its focus.

7. The laws of reflection hold good for

a. plane mirror only b. concave mirror only

c. convex mirror only d. all mirrors irrespective of their shape

8. A full length image of a distant tall building can definitely be seen by using

a. a concave mirror b. a convex mirror c. a plane mirror d. both concave as well as plane mirror

9. How many electrons will be there in 1.6 C charge?

a. 1017

b.1018

c.1019

d. 1020

10. What makes electric current flow through a solution?

a. Only free electrons b. Only positive ions c. Only negative ions d. Positive and negative ions​

Answer 1

Explanation:

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