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which of the following mirror is used by a dentist to examine a small cavity?

Question

(a) Convex mirror (b) Plane mirror (c) Concave mirror (d) Combination of convex and concave mirror

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Class 10 science 3 years 1 Answer 3 views Enlightened 0

Magnification produced by a rear view mirror fitted in vehicles [NCERT Exemplar Problems

Question

(a) is less than one (b) is more than one (c) is equal to one (d) can be more than or less than one depending upon the position of the object in front of it

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Class 10 science 3 years 1 Answer 5 views Enlightened 0

The path of a ray of light coming from air passing through a rectangular glass slab traced by four students are shown as A, B, C and D in figure. Which one of them is correct?

Question

(a) A (b) B (c) C (d) D

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Class 10 science 3 years 1 Answer 28 views Enlightened 0

Assertion: Increasing dependence on nuclear power generation is a threat for future generation. Reasoning: Radiation emitted during leakage can change the genetic arrangement.

Question

(a)Both the Assertion and the Reason are correct and the Reason is the correct explanation of the Assertion. (b) The Assertion and the Reason are correct but the Reason is not the correct explanation of the Assertion. (c) Assertion is ...

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Class 10 science 3 years 1 Answer 13 views Enlightened 0

Which of the following is a displacement reaction?

Question

(a) MgCO3 - → MgO + CO2 (b) 2Na + 2H20 - → 2NaOH + H2 (c) 2H2 + O2 → 2H2O Heat (d) 2Pb (NO3)2 2PbO + 4NO2 + O2

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Class 10 science 3 years 1 Answer 10 views Enlightened 0

Assertion (A) : Sodium metal is stored under Kerosene. Reason (R) : Metallic sodium melts when exposed to air.

Question

(a) Both A and R are true and R is the correct explanation of A. (b) Both A and R are true but R is not the correct explanation of A. (c) A is true but R is false. (d) ...

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Class 10 science 3 years 1 Answer 57 views Enlightened 0

Identify the products of the following reaction:

Question

a. Calcium hydrogencarbonate and chlorine gas b. Calcium chloride and water c. Calcium oxide, carbon dioxide and water d. Calcium chloride, carbon dioxide and water

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Class 10 science 3 years 1 Answer 52 views Enlightened 0

Galvanisation is a method of protecting iron from rusting by coating with a thin layer of

Question

(a) Galium (b) Aluminium (c) Zinc (d) Silver

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Class 10 science 3 years 1 Answer 6 views Enlightened 0

6. . When a few drops of iodine solution are added to rice water, the solution turns blue- black in colour. This indicates that rice water contains:

Question

(a) fats (b) complex proteins (c) starch (d) simple proteins

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Class 10 science 3 years 1 Answer 5 views Enlightened 0

29.Choose the event that does not occur in photosynthesis?

Question

A) Absorption of light energy by chlorophyll B) Reduction of carbon dioxide to carbohydrates C) Oxidation of carbon to carbon dioxide D) Conversion of light energy to chemical energy

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Class 10 science 3 years 1 Answer 10 views Enlightened 0

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