Mock Test-4 (Paper-1) (Question 51-100)

Total Questions: 50

21. Retina of the eye is comparable to which of the following parts of a traditional camera?

Correct Answer: (a) Film
Solution:Retina of the eye is comparable to the film of a traditional camera. Retina is a film of nerve fibres. Image of the object is formed at retina just like camera film is used to see the images.

22. A myopic eye can be corrected by using a

Correct Answer: (b) concave lens
Solution:Nearsightedness or myopia is the inability of the eye to focus on distant objects. The nearsighted eye has no difficulty viewing nearby objects. This condition results if the light from distant objects is refracted more than is necessary.

The cure for nearsighted eye is to equip it with a diverging or concave lens. Since the nature of the problem of nearsightedness is that the light before it reaches the eye. This light will then be converged by the cornea and lens to produce an image on the retina.

23. Microwave oven consumes less power due to

Correct Answer: (b) short wavelength of radiation
Solution:Microwave oven consumes less power due to short wavelength of radiation.

24. Which one of the following statements is not true for a person suffering from hypermetropia?

Correct Answer: (d) A concave lens is used to correct this defect.
Solution:Hypermetropia is corrected by using a concave lens. Myopia is corrected by convex lens.

25. The minimum height of a plane mirror to see the full size image of a person is equal to

Correct Answer: (b) half the height of the person
Solution:The minimum height of a plane mirror to see the full size image of a person is equal to the half the height of the person.

26. Which one of the following elements exists in liquid state at room temperature?

Correct Answer: (a) Mercury
Solution:Mercury exists in liquid state at room temperature. Bromine (Br) also exists as liquid at room temperature however it is a non-metal. Some other metals like caesium, gallium and rubidium exists as liquid slightly above room temperature.

27. The metal constituent of chlorophyll is

Correct Answer: (d) Magnesium
Solution:Chlorophyll is a green pigment in which at the centre of the ring is a magnesium ion. It also bears a long phytol chain.

28. Match List - I with List - II and select the correct answer using the code given below the lists:

List-I List-II 
(A) Compound present in Bones1. Lactic acid
(B) Acid present in vinegar2. Ethylene
(C) Souring of milk3. Acetic acid
(D) Ripening of fruits4. Calcium phosphate

 

Code:ABCD
(a)1234
(b)2143
(c)3412
(d)4312
Correct Answer: (d)
Solution:Compound Present in Bones - Calcium Phosphate

Acid Present in Vinegar - Acetic Acid

Souring of milk - Lactic acid

Ripening of fruits Ethylene

29. At 30°C, which 3 metals are all liquids ?

Correct Answer: (d) Hg, Ga, Cs
Solution:At room temperature (30°C), Hg, Ga, Cs metals are liquids.

30. Which one of the following metals occurs in nature in free state?

Correct Answer: (a) Gold
Solution:Gold is a stable noble metal and resists the action of the atmosphere and occurs in free state.