SCIENCE CLASS X MCQ SET 2 #mcqscienceclass10

Identify 'x', 'y', and 'z' in the following balanced reaction:
x\ Al(s)+y\ O_2(g)\ →\ z\ Al_2O_3\
Consider the following table, The value of x in the table below is
Magnesium reveal is rubbed with sandpaper before making it burns. The reason of rubbing the ribbon is to
A student traces the path of a ray of light through a glass prism for different angles of incidence. He analysis each diagram and draws the following conclusion:
I. On entering prism, the light ray bends towards its base
.II. Light ray suffers refraction at the point of incidence and point of emergence while passing through the prism.
III. Emergent ray bends at certain angle to the di- rection of the incident ray
.IV. While emerging from the prism, the light ray bends towards the vertex of the prism.Out of the above inferences, the correct ones are:
A feature of reproduction that is common to Amoeba, Spirogyra and yeast is that
When white light passes through the achromatic combination of prisms, then what is observed ?
Exposure of silver chloride to sunlight for a long duration turns grey due to
Which among the following statement(s) is/are correct true ?
(i)The formation of silver by decomposition of silver chloride
(ii) Sublimation of silver chloride
(iii) Decomposition gas chlorine gas from silver chloride
(iv) Oxidation of silver chloride
Human body stores energy in the form of
No matter how far you stand from a mirror, your image appears erect. The mirror is likely to be-
Posture and balance of the body is controlled by
Mineral acids are stronger acids than carboxylic acids because(i) mineral acids are completely ionized.
(ii) carboxylic acids are completely ionized
(iii) mineral acids are partially ionized
(iv) carboxylic acids are partially ionized
Assertion Photosynthesis is considered as an endothermic reaction.Reason: Energy gets released in the process of photosynthesis.
Assertion: Our body maintains blood sugar level. Reason: Pancreas secretes insulin which helps to regulate blood sugar levels in the body.
Assertion: Artificial kidney is a device used to remove nitrogenous waste products from the blood through dialysis. Reason: Reabsorption does not occur in artificial kidney.
Identify 'x', 'y', and 'z' in the following balanced reaction:
CaCO_3\ (s)\ Heat\ →\ CaO\ (s)+CO_2(g)
Quick lime combines vigorously with water to form (A) which reacts slowly with the carbon dioxide in air to form (B).Identify the compounds (A) and (B).

Identify the unsaturated compounds from the following:
(i) Propane
(ii) Propene
(iii) Propyne
(iv) Chloropropane(a) (i) and (ii)(b) (ii) and (iv)(c) (iii) and (iv)(d) (ii) and (iii)

Which of the following is a feasible reaction ?
A prism ABC (with BC as base) is placed in different orientations. A narrow beam of white light is incident on the prism as shown in figure. In which of the following cases, after dispersion, the third colour from the top corresponds to the colour of the sky?