## Class/Course - Class X

### Subject - Science

#### Total Number of Question/s - 4224

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• 1. Chemical Reactions and Equations - Quiz

1. The chemical reaction involved in the corrosion of iron metal is that of:
a) oxidation as well as displacement
b) reduction as well as combination
c) oxidation as well as combination
d) reduction as well displacement

2. It is acceptable to balance an equation by changing the formula of one of the reactants or products.
a) True
b) False

• 2. Acids, Bases and Salts - Quiz

1. Base, which is soluble in water is:
a) Oxides
b) Hydroxide
c) Alkali
d) All the above

2. _________ is an oxide which produce bases when dissolved in water
a) Acidic oxide
b) Basic oxide
c) Neutral oxide
d) None of these

• 3. Metals and Non-metals - Quiz

1. Out of aluminium, copper, calcium and tin, the most reactive metal us:
a) aluminium
b) copper
c) tin
d) calcium

2. What is the chemical name of the slag coming out of blast furnace?
a) Calcium acetate
b) Calcium silicate
c) Calcium formate
d) Calcium carbonate

• 4. Carbon and its Compounds - Quiz

1. Which of the following is formed when ethane is heated with conc. H2SO4 at 750C?
a) Methyl alcohol
b) Ethyl alcohol
c) Ethane
d) Ethanal

2. Chlorine reacts with saturated hydrocarbons at room temperature in the:
a) absence of sunlight
b) presence of sunlight
c) absence of moisture
d) presence of H2SO4

• 5. Periodic Classification of Elements - Quiz

1. The ascending later of IE can be represented as :
a) IE1 < IE2 < IE3
b) IE3 < IE2 < IE1
c) IE1 < IE3 < IE2
d) IE1 > IE2 < IE3

2. Five elements A, B, C, D and E have atomic numbers of 2, 3, 7, 10 and 18 respectively. The elements which belong to the same period of the periodic table are:
a) A, B, C
b) B, C, D
c) A, D, E
d) B, D, E

• 6. Life Processes - Quiz

1. Oxygen evolved in photosynthesis is
a) Form CO2 and H2O
b) From H2O
c) From CO2
d) From air

2. When air is blown from mouth into a test tube containing lime water, the lime water turns mi;lky due to the presence of:
a) oxygen
b) carbon dioxide
c) nitrogen
d) water vapour

• 7. Control and Coordination - Quiz

1. The growth movement of a plant in response to the touch of an object is called:
a) thigmonasty
b) hydrotropism
c) thigmotropism
d) geotropism

2. Which of the following are cerebral reflexes?
(i)a person pulls away his hand on touching a hot object
(ii) a person spits out immediately when a fly enters his mouth while taking
(iii) a person walking bare foot lifts his foot at once on stepping on to a nail
(iv) A persons pupil contracts at once in the presence og bright light
a) (i) and (ii)
b) (ii) and (iii)
c) (iii) and (iv)
d) (ii) and (iv)

• 8. How do Organisms Reproduce? - Quiz

1. Fertilization in human occurs in
a) Uterus
b) Fallopian tubes
c) Vagina
d) Urethra

2. AIDS is deadly disease which is caused by:
a) a protozoan
b) a fungus
c) a bacterium
d) a virus

• 9. Heredity and Evolution - Quiz

1. The sex of a child is determined by which of the following?
a) the length of the mothers pregenancy
b) the length of time between ovulation and population
c) the presence of an X chromosome in an ovum
d) the presence of Y chromosome in a sperm

2. According to scientists, aves have evolved from:
a) mammals
b) amphibians
c) reptiles
d) anthropods

• 10. Light - Reflection and Refraction - Quiz

1. To obtain a magnification of, -0.5 with a convex lens, the object should be placed:
a) at F
b) between optical centre and F
c) between F and 2F
d) beyond 2F

2. What is the minimum distance between an object and its virtual image is case of a concave lens ?
a) 0
b) f
c) 2f
d) 4f

• 11. Human Eye and Colourful World - Quiz

1. The colour of light which travels with minimum speed in glass is:
a) Violet
b) Blue
c) Green
d) Red

2. Light travels with velocities 2.5 x 105 m/s and 2 x 108 m/s through two different media. The critical angle of the media is :
a) sin-1(2/3)
b) sin-1(4/3)
c) sin-1(4/5)
d) sin-1(5/4)

• 12. Electricity - Quiz

1. The unit of electrical resistance is:
a) ampere
b) volt
c) coulomb
d) ohm

2. If the potential difference between the ends of a fixed resistor is halved, the electric power will become:
a) double
b) half
c) four times
d) one - fourth

• 13. Magnetic Effects of Electric Current - Quiz

1. The north-south polarities of an electromagnet can be found easily by using:
a) Fleming right-hand rule
b) Fleming left-hand rule
c) Clock face rule
d) Left-hand thumb rule

2. Which one the following has its working based on electromagnetic induction?
a) Galvanometer
b) Ammeter
c) Voltmeter
d) Transformer

• 14. Sources of Energy - Quiz

1. To produce electric power at the atomic power station, the process used is:
A. Nuclear fusion
B. Nuclear fission

a) Only A
b) Only B
c) Both A and B
d) None of these

2. Which of the following is not a fossil source of energy?
a) kerosene oil
b) cow-dung cakes
c) CNG
d) coal

• 15. Our Environment - Quiz

1. Natural gas is a mixture of
a) Methane, ethane and propane
b) Methane and oxygen
c) Methane and ethane
d) Methane, ammonia and oxygen

2. Sahara Desert was formed over a period of time due to one of the following uncontrolled activities of man:
a) excessive cutting down of forest plants and trees
b) excessive killing of large herbivores
c) excessive killing of large carnivores
d) excessive use of poisonous chemicals called herbicides

• 16. Management of Natural Resources - Quiz

1. Arabari forest of Bengal is dominated by:
a) teak
b) sal
c) bamboo
d) mangrovve

2. The three R`s which can helps us to conserve natural resources for long term use are:
a) recycle, regenerate, reuse
b) reduce, regenerate, reuse
c) reduce, reuse, redistribute
d) reduce, recycle, reuse