Question 1

. Read the following and answer any four questions from (i) to (v) A girl met with an accident and his leg fractured. She went to orthopedics doctor for treatment. On examination, the doctor mixed the white power in water and applied to her leg along with the cotton and gauze. After a while, it turned into white, solid, hard mass. He said that it would support her fractured bone in the right position.

Question

$. Read the following and answer any four questions from (i) to (v) A girl met with an accident and his leg fractured. She went to orthopedics doctor for treatment. On examination, the doctor mixed the white power in water and applied to her leg along with the cotton and gauze. After a while, it turned into white, solid, hard mass. He said that it would support her fractured bone in the right position.$

(1) After treatment, the doctor repacked the white powder back into moisture proof, airtight container. Why? (a) The fungus growth will occur in open (b) The powder would react to moisture and turn into solid mass (c) The powder with ...

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Class 10 science 3 years 0 Answers 20 views Enlightened 0

Question 2

Read the following and answer any four questions from 4(i) to 4(v). Chemically, Plaster of Paris (POP) is calcium sulphate hemihydrate, i.e., containing half molecule of water of crystallisation. It is represented by the formula, CaSO4-1/2H2O. Half molecule of water of crystallisation means that one water molecule is shared by two formula units of Caso. Hence, we also represent its formula as (Caso.),H,O. The name, plaster of Paris, was given to this compound because for the first time, it was made from gypsum which was mainly found in Paris.

Question

(i) The difference of water molecules in gypsum and plaster of Paris is (a) 5/2 (b) 2 (c) 1/2 d) 3/2 (ii) Plaster of Paris hardens by (a) giving off CO2 b) changing into CaCO2 (c) combining with water d) giving ...

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Class 10 science 3 years 0 Answers 41 views Enlightened 0

Question 3

The pH of commonly used toothpaste is

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A. <6.5 B. ≥7.0 C. ≥2.2 D. None of these

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Class 10 science 3 years 0 Answers 17 views Enlightened 0

Question 4

Butyric acid is found in

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A. Rancid butter B. Rancid cake C. Stings of bees D. All of these

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Class 10 science 3 years 0 Answers 8 views Enlightened 0

Question 5

. Read the following and answer any four questions from (i) to (v) In the below experiment, when an iron nail is dipped in copper sulphate solution, a brown coating of copper is formed in the surface of iron and the colour of copper sulphate solution changes from blue to pale green. The reaction shows that iron is more reactive than copper because it displaces copper from the copper sulphate solution.

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(i) The equation Cu + xHNO3 → Cu(NO3)2 + yNO2 + 2H2O. The values of x and y are (a) 3 and 5 (b) (b) 8 and 6 (c) (c) 4 and 2 (d) (d) 7 and 1 (ii) What happens ...

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Class 10 science 3 years 0 Answers 8 views Enlightened 0

Question 6

. Following is given a diagram showing an experimental set-up:

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The given set-up is used to carry out: a. Distillation of water b. Purification of water c. Electrolysis of water d. Hydrolysis

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Class 10 science 3 years 0 Answers 7 views Enlightened 0

Question 7

Before burning in air, the magnesium ribbon is cleaned by rubbing with a sand paper to:

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a. Make the ribbon surface shinier b. Remove the layer of magnesium oxide from the ribbon surface c. Remove the layer of magnesium carbonate from the ribbon surface d. Remove the moisture from the ribbon surface

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Class 10 science 3 years 0 Answers 6 views Enlightened 0

Question 8

Assertion: In a simple battery circuit the point of lowest potential is positive terminal of the battery. Reasoning: The current flows towards the lower potential that is from positive to negative

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(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 0 Answers 16 views Enlightened 0

Question 9

.Assertion: The current flowing through each resistor is the same when connected in series. Reason: The voltage drop across each resistor remains the same when connected in parallel.

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(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 0 Answers 19 views Enlightened 0

Question 10

.Assertion (A) : Decomposition of vegetable matter into compost is an example of exothermic reactions. Reason (R) : Exothermic reaction are those reactions in which heat is evolved

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(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 0 Answers 87 views Enlightened 0

Question 11

Assertion: Pupil is black in colour. Reason: Pupil is black in colour as no light is reflected in it.

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(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 0 Answers 26 views Enlightened 0

Question 12

.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 the Figures given below. In which of the following cases, after dispersion, the third colour from the top corresponds to the colour of the sky?

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Class 10 science 3 years 0 Answers 5 views Enlightened 0

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