Subject

Science

Class

CBSE Class 10

Pre Boards

Practice to excel and get familiar with the paper pattern and the type of questions. Check you answers with answer keys provided.

Sample Papers

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 Multiple Choice QuestionsShort Answer Type

1.

Write the molecular formula of first two members of homologous series having functional group –Cl.


First two members of homologous series having functional group –Cl:
a. CH3Cl (Chloromethane)
b. CH3CH2Cl (Chloroethane)

5620 Views

 Multiple Choice QuestionsMultiple Choice Questions

2. For demonstrating the preparation of soap in the laboratory which of the following combinations of an oil and a base would be most suitable?
  • Mustard oil and calcium hydroxide

  • Castor oil and calcium hydroxide

  • Turpentine oil and sodium hydroxide

  • Mustard oil and sodium hydroxide


D.

Mustard oil and sodium hydroxide

1553 Views

3.

A student took four test tubes P, Q, R and S and filled about 8 mL of distilled water in each. After that he dissolved an equal amount of Na2SO4 in P, K2SO4 in Q, CaSO4 in R and MgSO4 in S. On adding an equal amount of soap solution and shaking each test tube well, a good amount of lather will be obtained in the test tubes,

  • P and Q

  • P and R

  • P, Q and S

  • Q, R and S 


A.

P and Q

1396 Views

4.

A student while observing an embryo of a gram seed listed various parts of the embryo as listed below :

Testa, Micropyle, Cotyledon, Tegmen, Plumule, Radicle. On examining the list the teacher commented that only three parts are correct. Select these three correct parts :

  • Cotyledon, Testa, Plumule

  • Cotyledon, Plumule, Radicle

  • Cotyledon, Tegmen, Radicle

  • Cotyledon, Micropyle, Plumule


B.

Cotyledon, Plumule, Radicle

1367 Views

5.

You have four test tubes, A, B, C and D containing sodium carbonate, sodium chloride, lime water and blue litmus solutions respectively. Out of these the material of which test tube/ test tubes would be suitable for the correct test of acetic/ethanoic acid?

  • only A

  • A and B

  • B and C

  • A and D


D.

A and D

The chemical reaction between ethanoic (acetic) acid and sodium carbonate is:
2CH3COOH + Na2CO3 → 2 CH3COONa + CO2 + H2O
On passing CO2 gas through lime water, the lime water turns milky. The milky appearance of lime water is due to the formation of solid calcium carbonate (CaCO3).
Reaction:
Ca(OH)2 + CO2 → CaCO3 + H2O
therefore, out of four test tubes A, B, C and D, only A and D test tubes would be suitable for the correct test of acetic/ethanoic acid.

Acetic acid also reacts with lime water to give calcium acetate (CH3COO)2Ca) as a product. But here it is not considered as a correct test of acetic/ethanoic acid.
Reaction:
2 CH3COOH + Ca(OH)2 → (CH3COO)2Ca + 2H2O

Hence, the correct answer is the option (d).

9463 Views

6.

In the following diagram the correctly marked angles are:

  • ∠ A and ∠ e

  • ∠ i, ∠ A and ∠ D

  • ∠ A, ∠ r and ∠ e

  • ∠ A, ∠ r and ∠ D


A.

∠ A and ∠ e

1110 Views

7.

Three students A, B and C focussed a distant building on a screen with the help of a concave mirror. To determine focal length of the concave mirror they measured the distances as given below:
Student A : From mirror to the screen
Student B : From building to the screen
Student C : From building to the mirror
Who measured the focal length correctly

  • Only A
  • Only B
  • A and B
  • B and C

A.

Only A

D.

B and C
1460 Views

8.

If you focus the image of a distant object, whose shape is given
below, on a screen using a convex lens,

the shape of the image of this object on the screen would be:


C.

1580 Views

9.

The correct sequencing of the angle of incidence, the angle of emergence, the angle of refraction and lateral displacement shown in the following diagram by digits 1, 2, 3 and 4 is:

  • 2, 4, 1, 3

  • 2, 1, 4, 3

  • 1, 2, 4, 3

  • 2, 1, 3, 4


B.

2, 1, 4, 3

1004 Views

10.

Select the set of homologous organs from the following:

  • Wings of pigeon and a butterfly

  • Wings of bat and a pigeon

  • Forelimbs of cow, a duck and a lizard

  • Wings of butterfly and a bat


C.

Forelimbs of cow, a duck and a lizard

1247 Views