MCQs of Science (Second Term)

Unit 6: AIR

Q. No. 1: Select the correct answer by placing a on it.

1 / Air is
a / An element / b / An alloy / c / A mixture / d / A compound
2 / It is a thick blanket of air that covers the earth
a / Atmosphere / b / Lithosphere / c / Mesosphere / d / None of these
3 / One of the following is not a layer of the atmosphere
a / Troposphere / b / Biosphere / c / Thermosphere / d / Mesosphere
4 / The layer that supports life is
a / Mesosphere / b / Stratosphere / c / Thermosphere / d / Troposphere
5 / As we go up the air pressure
a / Decreases / b / Remain same / c / Increases / d / None of them
6 / Moving air s called
a / Storm / b / Hurricane / c / Wind / d / Cyclone
7 / The gadget used to show wind directions is
a / Barometer / b / Wind vane / c / Thermometer / d / None of these
8 / Stratosphere starts from
a / About 16 km / b / About 48 km / c / About 80km / d / About 700 km
9 / The major gas of the air is
a / Trace gases / b / Carbon dioxide / c / Nitrogen / d / Oxygen
10 / The percentage of oxygen in the air is
a / 20 / b / 21 / c / 22 / d / 23
11 / All are non reactive gases except
a / Argon / b / Nitrogen / c / Oxygen / d / Neon
12 / The gas that reduces rusting of iron is
a / Oxygen / b / Nitrogen / c / Carbon dioxide / d / Argon
13 / Large computer systems are cooled by
a / Solid nitrogen / b / Nitrogen gas / c / Liquid nitrogen / d / All of these
14 / This gas supports burning and rusting of iron
a / Neon / b / Carbon dioxide / c / Nitrogen / d / Oxygen
15 / The gas used for cutting and welding of metals is
a / Oxygen / b / Nitrogen / c / Helium / d / Hydrogen
16 / During respiration we take in
a / Hydrogen / b / Helium / c / Oxygen / d / Carbon dioxide
17 / Carbon dioxide gas turns lime water
a / Clear / b / Dark / c / Milky / d / None of these
18 / Dry ice is
a / Solid Carbon dioxide / b / Liquid nitrogen / c / Liquid oxygen / d / None of these
19 / Which gas is filled in weather balloons
A / Argon / b / Neon / c / Helium / d / All of these
20 / Advertisement lights are colorful due to
a / Helium gas / b / Argon gas / c / Neon gas / d / None of these
a / B / c / d
21 / Which one is not a noble gas?
A / Hydrogen / B / Helium / c / Neon / d / Argon
22 / The behavior of carbon dioxide in the atmosphere is called
a / Blue house effect / B / Black house effect / c / Greenhouse effect / d / All of theses

Unit 7 : Solutions and Suspensions

Q. No. 1: Select the correct answer by placing a on it.

1 / A solution is a mixture
a / Homogenous / b / Heterogeneous / c / All of these / d / None of theses
2 / The substance present in less amount in a solution
a / Solvent / b / Dilute / c / Solute / d / None of these
3 / The substance in which solute is dissolved
a / Solvent / b / Solute / c / Solution / d / Suspension
4 / All are solutions except
a / Salt in water / b / Alcohol in water / c / Sand in water / d / Sugar in water
5 / Air is a kind of solution
a / Liquid liquid / b / Solid liquid / c / Gas gas / d / Gas liquid
6 / Brass is a mixture of
a / Iron and carbon / b / Zinc and copper / c / Iron an copper / d / None of these
7 / Which one is the universal solvent
a / Milk / b / Petrol / c / Cooking oil / d / Water
8 / An aqueous solution contains
a / More water / b / Less water / c / Equal water / d / All of these
9 / All of these are insoluble in water except
a / Grease / b / Oil / c / Alcohol / d / Paint
10 / Water form human body excrete as
a / Respiration / b / Transpiration / c / Perspiration / d / None of these
11 / The solution with less quantity of solute is
a / Concentrated / b / Dilute / c / Suspension / d / Slurry
12 / Concentrated solutions contain
a / More solute / b / Less solute / c / No solute / d / None of these
13 / The solution in which the solvent cannot dissolve any more solute are
a / Saturated / b / Unsaturated / c / Supersaturated / d / All of these
14 / We can dissolve more solute in a solvent at a given temperature in
a / Supersaturated sol / b / Unsaturated sol / c / Saturated sol / d / Suspension sol
15 / The sea more in salt concentration is
a / Pacific sea / b / Black sea / c / Dead sea / d / Red sea
16 / The solubility of liquid solute increases with
a / Decrease in temperature / b / Increase in temperature / c / Constant temperature / d / All of these
17 / The solubility of gas solute increases with
a / Increase in temperature / b / Decrease in temperature / c / Constant temperature / d / All of these
18 / The standard room temperature is
a / 25 c / b / 20 c / c / 30 c / d / 35 c
19 / The mixture of two or more metals is
A / Alloy / b / Suspension / c / Solution / d / None of these
20 / All are alloys except
a / Brass / b / Bronze / c / steel / d / Lemonade
21 / The particles settle down in
a / Solution / B / Alloy / c / Suspension / d / None of these
22 / A suspension can be separated by
a / Filtration / B / Boiling / c / Condensation / d / distillation
23 / A yellow gold is made of
a / iron and silver / B / Copper and silver / c / Steel and silver / d / None of these
24 / Blood cells and platelets are suspended in solution called
a / Alloy / B / Mixture / c / Slurry / d / Plasma
25 / A suspension which contains a large amount of insoluble solute is called
a / Mixture / B / Slurry / c / Alloy / d / All of these
26 / Which one these is a suspension
a / Milk / B / Lemonade / c / Butter milk / d / Alcohol in water

UNIT 8: Energy and its Forms

Q. No. 1: Select the correct answer by placing a on it.

1 / The ability to do work is called
a / Force / b / Motion / c / Energy / d / All of these
2 / Energy can be divided into
a / Two forms / b / Three forms / c / Four forms / d / Five forms
3 / It is the energy stored in any object due to its position
a / Light energy / b / Sound energy / c / Potential energy / d / Kinetic energy
4 / Kinetic energy is due to
a / Position / b / Location / c / Motion / d / None of these
5 / Which one of these doesn’t possess potential energy
a / A wound up spring / b / A lift up stone / c / A stretched band / d / A moving car
6 / The form of energy stored in food ,fuels and batteries is
a / Kinetic / b / Mechanical / c / Chemical / d / Electrical
7 / The stored mechanical energy is also called
a / Elastic potential energy / b / Gravitational energy / c / Nuclear energy / d / None of these
8 / The gravitational energy is stored in an object due to its
a / Length / b / Height / c / Width / d / Depth
9 / The nucleus of an atom possess
a / Gravitational energy / b / Chemical energy / c / Nuclear energy / d / Electrical energy
10 / The moving water, air or wind has
a / Kinetic energy / b / Potential energy / c / Chemical energy / d / All of these
11 / The major source of light for us is
a / Fire / b / Candle / c / Sun / d / Moon
12 / Electricity is the flow of
a / Protons / b / Neutrons / c / Electrons / d / Nucleus
13 / Lightning is an example of
a / Heat energy / b / Light energy / c / Sound energy / d / Electrical energy
14 / When an object vibrates it produces
a / Sound energy / b / Light energy / c / Heat energy / d / All of these
15 / Energy cannot be produce nor it can be destroyed but can be changed from one form to another is called the law of
a / Conversation / b / Conservation / c / Conversion / d / None of these
16 / The devices that convert the forms of energy are called
a / Energy transformers / b / Energy converters / c / Energy chargers / d / None of these
17 / Which one of these is an energy converter
a / Plastic cards / b / Stone / c / Wood / d / Lamp
18 / The fossil fuels are
a / Oil, wood, metals / b / Metals, soil, water / c / Oil, gas, coal / d / All of these
19 / The energy which is produced by wind is called
A / Solar energy / b / Wind energy / c / Light energy / d / Sound energy
20 / The plant used for producing biogas
a / Gobar gas plant / b / Fertilizer plant / c / Ammonia gas plant s / d / None of these