Free Printable Middle School Science Review

1.

The process of comparing an unknown quantity with known quantity is called :

a)

(a) Load

b)

(b) Effort

c)

(c) Measurement

d)

(d) Weighing

2.

Which basic units are involved in dioptre unit ?

a)

(a) kg, m , sec, A

b)

(b) m

c)

(c) kg , m .N

d)

(d) kg, sec, N

3.

Which one is the unit of intensity of sound ?

a)

(a) Watt

b)

(b) deciball

c)

(c) pascal

d)

(d) Ampere

4.

How many inch in 1 yard?

a)

(a) 20 inch.

b)

(b) ) 25 inch.

c)

(c) ) 36 inch..

d)

(d) ) 39 inch.

5.

The product of 1gm and 1cm/s² is called

a)

(a) 1 joule

b)

(b) 1 Newton

c)

(c) 1 Pascal

d)

(d) 1 dyne

6.

A force, when acting on an object of 1 kg mass, produces acceleration of 1m/s2 in it is known as:

a)

(a) 1 Watt power

b)

(b) 1 Joule energy

c)

(c) 1 Pascal pressure

d)

(d) 1 Newton force

7.

On which place of earth the value of g is more of the following ?

a)

(a) Equator

b)

(b) Center

c)

(c) pole

d)

(d) Hilly region

8.

An object of mass 30 kg is taken to a height “h” where g = 5m/s² , there its mass is :

a)

(a) 5 kg

b)

(b) 6 kg

c)

(c) 15 kg

d)

(d) 30kg

9.

Distance of moon from earth is

a)

(a) 3.84 × 10⁸ m

b)

(b) 3.84 × 10⁸ km

c)

(c) 1.5 ×10⁸ km

d)

(d) 6 × 10⁸ m

10.

A cylindrical object of wood weighs 10 N on earth and 1.6 N on moon. Its mass is

a)

(a) 1 kg

b)

(b) 16 kg

c)

(c) 8.4 kg

d)

(d) 6.25 kg

11.

Which one is the right relation between density(D) and volume(V) of an object?

a)

(a) D = V

b)

(b) D ∝ V

c)

(c) D ∝1/v

d)

(d) D ∝1/v²

12.

A device which is used to measure the density of liquid is called?

a)

(a)Thermometer .

b)

(b) Lactometer .

c)

(c) Hydrometer.

d)

(d) Nanometer.

13.

The ratio of density of the substance to the density of water at 4⁰c is called:

a)

(a) Essential density.

b)

(b) Liquid density.

c)

(c) Proper density.

d)

(d) Relative density.

14.

When upthrust is equal to weight of an object, it

a)

(a) floats

b)

(b) sinks

c)

(c) moves

d)

(d) stops

15.

Barometer is invented by

a)

(a) Galileo

b)

(b) Robert Boyle

c)

(c) Charles

d)

(d) Torricelli

16.

Which one is different among them?

a)

(a) mc²

b)

(b) hdg.

c)

(c) 1/2mv²

d)

(d) mgh

17.

Capacity of a body to do work is called

a)

(a) energy

b)

(b) work load

c)

(c) kinetic energy

d)

(d) potential energy

18.

Which of the following is the form of heat?

a)

(a) energy

b)

(b) force

c)

(c) power

d)

(d) resistance

19.

On Fahrenheit scale, upper fixed point is marked as

a)

(a) 32 °F

b)

(b) 212 °F

c)

(c) 100 °F

d)

(d) 0 °F

20.

Melting point of ice at Fahrenheit is

a)

(a) 32 degree

b)

(b) 100 degree

c)

(c) 212 degree

d)

(d) 75 degree

21.

Boiling point of liquid hydrogen is equal to −253 °C, which is equal to

a)

(a) 373 K

b)

(b) 20 K

c)

(c) 273 K

d)

(d) 100 K

22.

Amount of heat energy required to raise temperature of 1 kg of substance by 1 °C is termed as

a)

(a) General Heat capacity

b)

(b) Specific Heat Capacity

c)

(c) Latent Heat

d)

(d) Specific Latent Heat

23.

Between the melting point and boiling point at a substance is a .................. .

a)

(a) Solid

b)

(b) Liquid

c)

(c) Gas

d)

(d) Crystal

24.

Angle of incidence is equal to angle of ...................... .

a)

(a) reflection

b)

(b) refraction

c)

(c) transmission

d)

(d) incident

25.

Angle of reflection lies between reflected ray and ............. .

a)

(a) normal line

b)

(b) incident ray

c)

(c) convergent ray

d)

(d) all of them

26.

Ratio of speed of light in air ( vacuum) and speed of light in a medium is known as

a)

(a) regular reflection

b)

(b) reflective index

c)

(c) refractive index

d)

(d) regular refraction

27.

Power of a lens is defined as reciprocal of its ................... .

a)

(a) focal length in meter

b)

(b) principal axis

c)

(c) optical centre

d)

(d) vertex

28.

Study of light behavior is called

a)

(a) lenses

b)

(b) optics

c)

(c) mechanics

d)

(d) heat

29.

The image which cannot be obtained on the screen is called:

a)

(a) imaginary image

b)

(b) Real image

c)

(c) inverted image

d)

(d) Virtual image

30.

People with long-sightedness are treated by using .................... .

a)

(a) concave lens

b)

(b) convex lens

c)

(c) lens

d)

(d) none of them

31.

If the radius of curvature of a mirror is 20cm then the focal length is

a)

(a) 20cm

b)

(b) 10cm

c)

(c) 40cm

d)

(d) 5cm

32.

Which of the following has longest wavelength ?

a)

(a) radio waves

b)

(b) infrared

c)

(c) ultraviolet

d)

(d) gamma rays

33.

Which of the following is speed of light in vacuum ?

a)

(a) 0.3 × 10⁷ m/s

b)

(b) 3 × 10⁷ m/s

c)

(c) 30 × 10⁷ m/s

d)

(d) 3 × 10⁸ km/s

34.

When a person has hypermetropia, the image is formed

a)

(a) in front of retina

b)

(b) behind retina

c)

(c) on blind spot

d)

(d) none of them

35.

Electric current generates from which part of an atom?

a)

(a) Nucleus

b)

(b) Proton

c)

(c) Electron

d)

(d) Neutron

36.

Which on is converts chemical energy into electric energy?

a)

(a) Solar cell

b)

(b) generator

c)

(c) Battery

d)

(d) Nichrome wire

37.

According to the Ohm’s law, if resistance decreases and voltage stays the same then :

a)

(a) resistance increases

b)

(b) Current increases

c)

(c) Current remains same

d)

(d) Current decreases

38.

Which instrument is used to measure the resistance of electricity?

a)

(a) ammeter

b)

(b) voltmeter

c)

(c) ohmmeter

d)

(d) wattmeter

39.

A current of 2A flows through a 12V bulb then calculate the resistance .

a)

(a) 24 Ohm

b)

(b) 0.165 Ohm

c)

(c) 6 Ohm

d)

(d) 48 Ohm

40.

1 Ampere is equal to :

a)

(a) 1 colb/1sec.

b)

(b) 1 colb ×1sec

c)

(c) 1 sec/1 colb

d)

(d) None of above

41.

By which metal the filament of an electric bulb is made of?

a)

(a) carbon

b)

(b) Nichrome

c)

(c) aluminium

d)

(d) tungsten

42.

Nichrome wire is an alloy of :

a)

(a) copper and silver

b)

(b) nickel and chromium

c)

(c) lead and Zinc

d)

(d) nitrogen and chromium

43.

Which of the following is the source of electricity?

a)

(a) Bulb

b)

(b) Cell

c)

(c) Transformer

d)

(d) Voltmeter

44.

A short thin piece of wire which is heated up and melt by flowing of electric current in it, is called

a)

(a) circuit

b)

(b) fuse

c)

(c) cell

d)

(d) resistor

45.

In Nepal, frequency of alternating current is

a)

(a) 40 Hz

b)

(b) 50 Hz

c)

(c) 60 Hz

d)

(d) 70 Hz

46.

Adding common salt to distilled water makes it

a)

(a) Good conductor

b)

(b) Insulator

c)

(c) Resistor

d)

(d) Both a and b

47.

When water is electrolyzed, then which gas collected at cathode?

a)

(a) sulphur

b)

(b) oxygen

c)

(c) hydrogen

d)

(d) sulphur dioxide

48.

Abbreviation of 'MCB' is for

a)

(a) moving circuit breaker

b)

(b) manual current breaker

c)

(c) manual circuit breaker

d)

(d) miniature circuit breaker

49.

If secondary voltage is smaller than primary voltage, transformer is called as:

a)

(a) positive transformer

b)

(b) step-up transformer

c)

(c) negative transformer

d)

(d) step-down transformer

50.

What is the angle of dip at the magnetic pole of the earth?

a)

(a) 0⁰

b)

(b) 45⁰

c)

(c) 90⁰

d)

(d) 120⁰

51.

Nichrome is known as

a)

(a) lighting element

b)

(b) heating element

c)

(c) inert element

d)

(d) active element

52.

Which of the following is source of current ?

a)

(a) Ammeter

b)

(b) Voltmeter

c)

(c) Galvanometer

d)

(d) Battery

53.

What is the SI unit of the ratio of quantity of charge “Q” and time “t” ?

a)

(a) Volt

b)

(b) Ampere

c)

(c) Ohm

d)

(d) Watt

54.

The formation of hydrogen layer on copper plate in dry cell is known as:

a)

(a) local action

b)

(b) polarization

c)

(c) anode

d)

(d) amalgamating

55.

What is the power of a lamp, if it is connected to a 12 V battery and draws a current of 0.5 A?

a)

(a) 6 W

b)

(b) 0.5 W

c)

(c) 12W

d)

(d) 24W

56.

Average distance between nucleus and outer shell is called ............. .

a)

(a) atomic size

b)

(b) nuclear size

c)

(c) shielding effect

d)

(d) none of above

57.

Which group of periodic table contains alkaline earth metal?

a)

(a) IA

b)

(b) IIIA

c)

(c) IIA

d)

(d) IVA

58.

Brass is an example of

a)

(a) An alloy

b)

(b) a compound

c)

(c) a mixture

d)

(d) an element

59.

When 4S orbital is complete, the entering electron goes into

a)

(a) 5s

b)

(b)5p

c)

(c) 3d

d)

(d) 4p

60.

Which of the following is the very light and inert gas?

a)

(a) oxygen

b)

(b) hydrogen

c)

(c) helium

d)

(d) neon

61.

How many number of neutrons (n⁰) in Atom of aluminum (Al)?

a)

(a) 13

b)

(b) 27

c)

(c) 14

d)

(d) 13

62.

A substance whose all atoms have same atomic number is ............. .

a)

(a) molecule

b)

(b) element

c)

(c) atom

d)

(d) ion

63.

All of these radicals have a valency of 2, except ............... .

a)

(a) SO₄

b)

(b) CO₃

c)

(c) NH₄

d)

(d) SiO₃

64.

All are covalent compounds except .................... .

a)

(a) CH₄

b)

(b) C₂H₆

c)

(c) CH₃Cl

d)

(d) NaCl

65.

Number of proton, neutron and electron in sulfide ion is respectively ....................... .

a)

(a) 16,17 and 18

b)

(b) 17,16 and 18

c)

(c) 18,17 and 16

d)

(d) 16,16 and 18

66.

When state of matter is changed from liquid to gas, we call it

a)

(a) melting

b)

(b) freezing

c)

(c) boiling

d)

(d) condensing

67.

The horizontal rows in a periodic table are called

a)

(a) atomic structure

b)

(b) periods

c)

(c) actinides

d)

(d) groups

68.

Which one is wrong statement?

a)

(a) Number of neutrons = atomic mass – atomic number

b)

(b) Atomic number = number of proton = number of electron

c)

(c) Atomic number = atomic mass – numbers of neutron

d)

(d) atomic mass = numbers of neutrons – atomic number

69.

From left to right in a period of periodic table proton number

a)

(a) decrease

b)

(b) neutral

c)

(c) increase

d)

(d) none

70.

NaOH + HCl →

a)

(a) Na(OH)₂ + H₂

b)

(b) NaCl + H₂

c)

(c) NaCl + H₂O

d)

(d) NaCl + H₂ + O₂

71.

To balance Al(OH)₃ + HNO₃ → Al(NO₃)₃ + H₂O, number HNO₃molecules will be

a)

(a) 1

b)

(b) 2

c)

(c) 3

d)

(d) 4

72.

In Na₂CO₃, relative atomic mass of Oxygen is

a)

(a) 12 amu

b)

(b) 24 amu

c)

(c) 36 amu

d)

(d) 48 amu

73.

If atomic weight and proton number of an atom is 24 and 12 respectively, number of electrons and neutron will be

a)

(a) 36,12

b)

(b) 12,12

c)

(c) 24,24

d)

(d) 12,24

74.

If NaOH reacts with HCl, reaction can be known as

a)

(a) combustion

b)

(b) Thermal decomposition

c)

(c) Neutralization

d)

(d) Decomposition

75.

Phosphoric acid has formula .......... .

a)

(a) H₂PO₃

b)

(b) H₂PO₄

c)

(c) H₃PO₄

d)

(d) H₃PO₃

76.

In pH , the p is stand for :

a)

(a) proton

b)

(b) potential

c)

(c) process

d)

(d) primary

77.

Metal oxides are also called:

a)

(a) acid oxides

b)

(b) basic oxides

c)

(c) neutral oxides

d)

(d) none

78.

When acid reacts with metal carbonate, products are

a)

(a) salt

b)

(b) water

c)

(c) carbon dioxide

d)

(d) all of above

79.

Which one is not a base?

a)

(a) NaOH

b)

(b) HNO₃

c)

(c) Ca(OH)₂

d)

(d) NH₄OH

80.

−78 °C is the….

a)

(a) freezing point of carbon dioxide

b)

(b) boiling point of carbon dioxide

c)

(c) melting point of oxygen gas

d)

(d) Both A and B

81.

Name a gas which is used in making chloroform?

a)

(a) Methane

b)

(b) Propane

c)

(c) Butane

d)

(d) Acetylene

82.

Which gas is produced when metal react with acids

a)

(a) Oxygen

b)

(b) Nitrogen

c)

(c) Hydrogen

d)

(d) Carbon dioxide

83.

What is dry ice?

a)

(a) Solid Oxygen

b)

(b) Solid Carbon Dioxide

c)

(c) Solid Hydrogen

d)

(d) Solid Nitrogen

84.

Ore of iron is ......................... .

a)

(a) Haematite

b)

(b) Chalcopyrite

c)

(c) Bauxite

d)

(d) Halite

85.

Which of the following is represent mercury(ii) ion correctly ?

a)

(a) Hg ^--

b)

(b) Hg ⁺⁺

c)

(c) Hg₂ ⁺⁺

d)

(d) Hg₂^--

86.

Formula of tetra chloromethane is ................. .

a)

(a) CCl₄

b)

(b) CH₄Cl₄

c)

(c) C(HCl)₄

d)

(d) C₄. HCl₄

87.

Chloroform is also called

a)

(a) Chloromethane

b)

(b) Dichloromethane

c)

(c) Trichloromethane

d)

(d) Tetrachloromethane

88.

What is general formula of alkenes?

a)

(a) CnH2n+2

b)

(b) CnH2n

c)

(c) CnH2n-2

d)

(d) None of these

89.

If we remove one hydrogen (H) atom from alkane (saturated hydrocarbon), we get

a)

(a) alkyl group

b)

(b) alkene group

c)

(c) alkyne group

d)

(d) aldehyde group

90.

General formula for alcohol is

a)

(a) R-OH

b)

(b) R-O-R

c)

(c) R-COOH

d)

(d) R-NH2

91.

Ice floats on top of water because

a)

(a) Water expands on freezing

b)

(b) Water contracts on freezing

c)

(c) Ice is lighter than iron

d)

(d) None of these

92.

Insoluble salt is ..................... .

a)

(a) Sodium Chloride

b)

(b) Lead Chloride

c)

(c) Magnesium Chloride

d)

(d) Potassium hydroxide

93.

Solution of mercury with other metals is called

a)

(a) amalgam

b)

(b) sat urated solution

c)

(c) supersaturated solution

d)

(d) unsaturated solution

94.

What is molecular formula of sodamide?

a)

(a) NaOH

b)

(b) NH₂CONH₂

c)

(c) NaNH₂

d)

(d) Ca(OH)₂

95.

Oxygen is used in the production of which type of gas for welding and cutting?

a)

(a) Propane

b)

(b) Butane

c)

(c) Acetylene

d)

(d) Methane

96.

Solid solutions of metals are called

a)

(a) alloys

b)

(b) amalgams

c)

(c) saturated solutions

d)

(d) supersaturated solution

97.

What is the chemical equation for the reaction that produces carbon dioxide from vinegar and baking soda?

a)

(a) NaHCO₃+ HCl → NaCl + H₂O + CO₂

b)

(b) NaHCO₃+ H₂SO₄→ Na₂SO₄+ H₂O + CO₂

c)

(c) NaHCO₃ + NaOH → Na₂CO₃+ H₂O + CO₂

d)

(d) NaHCO₃ + CH₃COOH → NaCH₃COO + H₂O + CO₂

98.

What is an example of a second-grade preservative?

a)

(a) Sodium benzoate

b)

(b) Salt

c)

(c) Ascorbic acid

d)

(d) Vinegar

99.

Methane' is an example of

a)

(a) carbohydrates

b)

(b) hydrocarbons

c)

(c) alcohols

d)

(d) alkenes

100.

Acetylene is another name of

a)

(a) Ethyne

b)

(b) Propene

c)

(c) Butene

d)

(d) Pentene

101.

What is physical state of first four alkanes?

a)

(a) Solid

b)

(b) Liquid

c)

(c) Gas

d)

(d) Plasma

Middle School Science Review

Total questions: 101

Worksheet time: 51mins

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