﻿ A student was given two permanent slides, one of binary fission in amoeba and other of budding in yeast. He was asked to identify any one difference in the nucleus of the two. One such difference, he identified correctly was from Class 10 CBSE Previous Year Board Papers | Science 2011 Solved Board Papers

## 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

Download the PDF Sample Papers Free for off line practice and view the Solutions online.

# CBSE Class 10 Science Solved Question Paper 2011

#### Multiple Choice Questions

1.

For finding the focal length of a convex lens by obtaining the image of a distant object, one should use as the object.

• A well-lit distant tree

• Window grill in the class room

•  Any distant tree

• A lighted candle kept at the other end of the table.

A.

A well-lit distant tree

664 Views

2.

Raisins are wiped off gently before final weighing with help of

• a filter paper

• a cotton piece

• a cloth piece

• a polythene piece

A.

a filter paper

859 Views

3.

Rahim recorded the following sets of observations while tracing the path of a ray of light passing through a rectangular glass slab for different angles of incidence.

 S. No. Angle of incidence Angle of refraction Angle of emergence

The correct observations are recorded at a serial number:

•  I 45o 41o 45o
•  II 40o 38o 38o
•  III 45o 41o 40o
•  IV 41o 45o 41o

A.

 I 45o 41o 45o
1242 Views

4.

To find the focal length of a concave mirror Rahul focuses a distant object with this mirror. The chosen object should be

• A tree

• A building

• A window

• The sun

D.

The sun

686 Views

5.

Mohan obtained a sharp inverted image of a distant tree on the screen placed behind the lens. He then moved the screen and tried to look through the lens in the direction of the object. He would see:

• a blurred image on the wall of the laboratory.

• an erect image of the tree on the lens.

• no image as the screen has been removed

• an inverted image of the tree at the focus of the lens.

A.

a blurred image on the wall of the laboratory.

745 Views

6.

Binary fission is observed in which one of the following figures?

C.

Binary fission in Amoeba.

1085 Views

7.

To determine the percentage of water absorbed by raisins, raisins are soaked in water for:

• 30 seconds

• 10 minutes

• 2 to 3 hours

•  24 hours

A.

30 seconds

C.

2 to 3 hours

1034 Views

# 8.A student was given two permanent slides, one of binary fission in amoeba and other of budding in yeast. He was asked to identify any one difference in the nucleus of the two. One such difference, he identified correctly was Presence of one nucleus in amoeba, two in yeast cell and one in bud.  Presence of two nuclei in centrally constricted amoeba, one in yeast cell and one in its bud. Presence of two distant nuclei in amoeba, one in yeast cell and two in bud. Presence of a single nucleus each in amoeba, yeast cell and its attached bud.

B.

Presence of two nuclei in centrally constricted amoeba, one in yeast cell and one in its bud.

Presence of two nuclei in centrally constricted amoeba, one in yeast cell and one in its bud.

7799 Views

9.

Four students A, B, C and D traced the paths of incident ray and the emergent ray by fixing pins P and Q for incident ray and pins R and S for emergent ray for a ray of light passing through a glass slab.

The correct emergent ray was traced by the student:

B.

1040 Views

10.

The step(s) necessary for determining the percentage of water absorbed by raisins is/are:

• Raisins should be completely immersed in water

• Raisins should be soaked in water for sufficient time

• Gently wipe dry the soaked raisins

• All of the above steps.

D.

All of the above steps.

777 Views