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# TET Class 12 Science Solved Question Paper 2013

#### Multiple Choice Questions

1.

Aqueous solution of which of the following oxides will change the colour of blue litmus to red?

• Copper oxide

• Iron oxide

• Magnesium oxide

• Sulphur dioxide

D.

Sulphur dioxide

Litmus paper is used for testing the acidic or basic nature of a substance. These are two colour litmus papers, i.e. red and blue. If red litmus turns blue on dipping in a solution. It shows the given solution is basic. If blue litmus turns red on dipping in a solution, it shows the given solution is acidic. Non-metal oxides are acidic in nature. Hence, their equines solution will change the colour of blue litmus to red.

2.

You are provided with a concave mirror, a concave lens, a convex mirror and a convex lens. To obtain an enlarged image of an object you can use either

• concave lens or convex lens

• concave mirror or convex mirror

• concave mirror or concave lens

• concave mirror or convex lens

D.

concave mirror or convex lens

3.

Frogs and earthworms breathe through their skin because of which the skin of both the organisms is

• dry and rough

• dry and slimy

• moist and rough

• moist and slimy

D.

moist and slimy

4.

Study the following statements about the effects of weeds on the crop plants
A. They help crop plants to grow healthily.
B. They interfere in harvesting.
C. They affect plant growth.
D. They compete with crop plants for water, nutrients, space, and light.

The correct statements are

• C and D

• Only D

• B, C, and D

• A, B and D

C.

B, C, and D

Weeds interfere in harvesting, they affect plant growth and compete with crop plants for water, nutrients, space, and light.

5.

Two organisms are best friends and live together. One provides shelter, water and nutrients while the other prepares and provides food. Such an association of organisms is termed as

• autotrophy

• parasitism

• heterotrophy

• symbiosis

D.

symbiosis

Symbiotic relationships include those associations in which one organism lives on another (ectosymbiosis, such as mistletoe) or where one partner lives inside the other (endosymbiosis, such as lactobacilli and other bacteria in humans or zooxanthellae in corals). Symbiotic relationships may be either obligate, i.e. necessary for the survival of at least one of the organisms involved or facultative, where the relationship is beneficial but not essential for the survival of the organisms

6.

The steps required for the conversion of kitchen garbage into manure are given
below in a jumbled form.
A. Put the garbage in the pit.
B. Cover the bottom of the pit with sand.
C. Cover the pit loosely with grass or a gunny bag.
The correct sequence of these steps is

• B, A, C, D

• B, C, A, D

• B, A, D, C

• B, D, A, C

C.

B, A, D, C

The steps required for the conversion of kitchen garbage into manure are: cover the bottom of the pit with sand, put the garbage in the pit, add worms and at last cover the pit loosely with grass or a gunny bag.

7.

Select from the following a set of Kharif crops.

• Gram, mustard, groundnut, wheat

B.

Kharif crops are the crops that are planted during June or July and harvested after the monsoon, i.e. September or October. This is because they require a large amount of water. Examples of Kharif crops are paddy, maize, soyabean, cotton, and millet.

8.

When we add aluminum foil to freshly prepared sodium hydroxide solution a gas is produced. Which of the following correctly states the property of this gas?

• Colourless and odourless gas which extinguishes a burning match stick

• Colourless and odourless gas which promotes burning of a candle

• Brown coloured pungent-smelling gas

• Colourless and odourless gas which produces a 'pop' sound when a burning match stick is brought near

D.

Colourless and odourless gas which produces a 'pop' sound when a burning match stick is brought near

Aluminum is a metal; so when it reacts with sodium hydroxide, hydrogen gas is produced. Following reaction takes place.

2Al+ 2NaOH+ 2H2O$\stackrel{\mathrm{Heat}}{\to }$2NaAIO2 + 3H2

A pop sound is produced due to the release of odourless and colourless hydrogen gas.

9.

In the alimentary canal, the swallowed food moves downwards because of

• the contraction of muscles in the wall of food pipe

• the flow of fluid material taken with the food

• gravitational pull

• force provided by the muscular tongue

A.

the contraction of muscles in the wall of food pipe

10.

While going for a picnic a student noted the reading on the odometer on the bus after every 10 min till the end of the journey. Later on, he recorded the reading in a table shown below

 Time(am) Odometer Reading 8:00 78752 8:10 78758 8:20 78768 8:30 78780 8:40 78791 8:50 78800 9:00 78806

The average speed of the bus in the entire journey (in m/s) was

• 15

• 18

• 30

• 54

A.

15

The total distance travelled by the bus = 78752 - 78806 = 54 km

The total time taken by bus = 9:00 - 8:00 = 1 h

Therefore, the average speed =54 km/h = 15 m/s