Q10 of 30 Page 1

A real image is formed by the light rays after reflection or refraction when they :

(A) actually meet or intersect with each other.


(B) actually converge at a point.


(C) appear to meet when they are produced in the backward direction.


(D) appear to diverge from a point. Which of the above statements are correct?


A. (A) and (D) B. (B) and (D)


C. (A) and (B) D. (B) and (C)


OR


Consider the following properties of virtual images:


(A) cannot be projected on the screen


(B) are formed by both concave and convex lens


(C) are always erect


(D) are always inverted The correct properties are :


A. (A) and (D) B. (A) and (B)


C. (A), (B) and (C) D. (A), (B) and (D)


(c) A real mage is obtained when the rays of light actually converge at a point or they actually intersect with each other. If they ray of light appears to be coming from the backwards direction, then the image is virtual.


OR


(c) Both convex and concave lens can produce virtual image and a virtual image cannot be projected on a screen. A virtual image is always erect with respect to the object.


More from this chapter

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7

When sodium hydrogen carbonate is added to ethanoic acid a gas evolves. Consider the following statements about the gas evolved?

(A) It turns lime water milky.


(B) It is evolved with a brisk effervescence.


(C) It has a smell of burning sulphur.


(D) It is also a by-product of respiration. The correct statements are:


 8

When a small amount of acid is added to water, the phenomena which occur are :

(A) Dilution


(B) Neutralisation


(C) Formation of H3 O+ ions


(D) Salt formation The correct statements are :


 10

At the time of short circuit, the electric current in the circuit:

A. vary continuously B. does not change


C. reduces substantially D. increase heavily


OR


Two bulbs of 100 W and 40 W are connected in series. The current through the 100 W bulb is 1 A. The current through the 40 W bulb will be:


A. 0.4 A B. 0.6 A


C. 0.8 A D. 1 A


 11

Calcium oxide reacts vigorously with water to produce slaked lime.


This reaction can be classified as:


(A) Combination reaction (B) Exothermic reaction


(C) Endothermic reaction (D) Oxidation Reaction


Which of the following is a correct option?


A. a and c B. c and c


C. a,c and d D. a and b


OR


When hydrogen sulphide gas is passed through a blue solution of copper sulphate, a black participate of copper sulphide is obtained and the sulphuric acid so formed remains in the solution . The reaction is an example of a :


A. Combination reaction B. Displacement reaction


C. Decomposition reaction D. Double displacement