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ASHOK PHUTELA
ABOHAR) FAZILKA

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1  Oxidation is a process which involves*

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addition of oxygen

addition of hydrogen

removal of oxygen

removal of hydrogen

 

2  The process of reduction involves*

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addition of oxygen

addition of hydrogen

removal of oxygen

removal of hydrogen

 

3  At what temperature is gypsum heated to form Plaster of Paris?*

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90°C

100°C

110°C

120°C

 

4   How many water molecules does hydrated cal-cium sulphate contain?*

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) 5

10

7

2

 

5    Which property of metals is used for making bells and strings of musical instruments like Sitar and Violin?*

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Sonorousness

Malleability

Ductility

Conductivity

6  . Which of the following is the correct arrange-ment of the given metals in ascending order of their reactivity?

Zinc, Iron, Magnesium, Sodium

*

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Zinc > Iron > Magnesium > Sodium

Sodium > Magnesium > Iron > Zinc

Sodium > Zinc > Magnesium > Iron

Sodium > Magnesium > Zinc > Iron

 

7  . Which of the following will undergo addition reactions?*

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CH4

C3H8

C2H6

C2H4

 

8   Roots of the plants absorb water from the soil through the process of:*

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diffusion

transpiration

osmosis

None of these

 

9  . The site of photosynthesis in the cells of a leaf is*

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chloroplast

mitochondria

cytoplasm

protoplasm

 

10   In amoeba, food is digested in the:*

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food vacuole

mitochondria

pseudopodia

chloroplast

 

11   Response of plant roots towards water is called:*

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Chemotropism

Phototropism

Hydrotropism

Geotropism

 

12   Movement of sunflower in accordance with the path of Sun is due to*

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Chemotropism

Geotropism

Phototropism

Hydrotropism

 

13   The ability of a cell to divide into several cells during reproduction in Plasmodium is called*

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budding

multiple fission

binary fission

reduction division

 

14   Bryophyllum can be propagated vegetatively by the*

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stem

leaf

root

flower

 

15 Two pink coloured flowers on crossing resulted in 1 red, 2 pink and 1 white flower progeny. The nature of the cross will be
*

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double fertilisation

self pollination

cross fertilisation

no fertilisation

 

16 The diagram showing the correct path of the ray after passing through the*

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II and III only

I and II daly

I, II and III

I, II and IV

17 Rays from Sun converge at a point 15 cm in front of a concave mirror Where should an object be placed so that size of its image is equal to the size of the object?
*

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15cm in front of mirror

30cm in front of the mirror

between 15cm and 20cm in front of the mirror

more than 30cm in front of mirror

 

18  One cannot see through the fog, because*

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refractive index of the fog is very high

light suffers total reflection at droplets

fog absorbs light

light is scattered by the droplets

 

19 The clear sky appears blue because*

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blue light gets absorbed in the atmosphere

ultraviolet radiations are absorbed in the atmosphere

violet and blue lights get scattered more than lights of all other colours by the atmosphere

light of all other colours is scattered more than the violet and blue colours lightts by the atmosphere

 

20 When electric current is passed, electrons move from:*

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high potential to low potential.

low potential to high potential.

in the direction of the current.

against the direction of the current.

 

21 The heating element of an electric iron is made up of:*

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copper

nichrome

aluminium

iron

22  We can induce the current in a coil by*

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moving the coil in a magnetic field

by changing the magnetic field around it

by changing the orientation of the coil in the magnetic field

All of above

 

23 If the current values periodically from zero to a maximum value, back to zero and then reverses its direction, the current is*

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direct

alternative

pulsating

none of the above

 

24 . First link in any food chain is usually green plants because
*

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they are widely distributed

they are fixed at one place in the soil

they alone have the capacity to synthesise food using sunlight

there are more herbivores than carnivores

 

25  Which of the following statements about food chain and energy flow through ecosystem is false?*

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Food webs include two or more food chains.

All organisms that are not producers are consumers.

A single organism can feed at several trophic levels.

Detritivores feed at all trophic levels except the produ