SCIENCE 100
Assessment
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Devendra Karna
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Science
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8th - 12th Grade
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101 questions
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1.
Multiple Choice
The process of comparing an unknown quantity with known quantity is called :
(a) Load
(b) Effort
(c) Measurement
(d) Weighing
2.
Multiple Choice
Which basic units are involved in dioptre unit ?
(a) kg, m , sec, A
(b) m
(c) kg , m .N
(d) kg, sec, N
3.
Multiple Choice
Which one is the unit of intensity of sound ?
(a) Watt
(b) deciball
(c) pascal
(d) Ampere
4.
Multiple Choice
How many inch in 1 yard?
(a) 20 inch.
(b) ) 25 inch.
(c) ) 36 inch..
(d) ) 39 inch.
5.
Multiple Choice
The product of 1gm and 1cm/s2 is called
(a) 1 joule
(b) 1 Newton
(c) 1 Pascal
(d) 1 dyne
6.
Multiple Choice
A force, when acting on an object of 1 kg mass, produces acceleration of 1m/s2 in it is known as:
(a) 1 Watt power
(b) 1 Joule energy
(c) 1 Pascal pressure
(d) 1 Newton force
7.
Multiple Choice
On which place of earth the value of g is more of the following ?
(a) Equator
(b) Center
(c) pole
(d) Hilly region
8.
Multiple Choice
An object of mass 30 kg is taken to a height “h” where g = 5m/s2 , there its mass is :
(a) 5 kg
(b) 6 kg
(c) 15 kg
(d) 30kg
9.
Multiple Choice
Distance of moon from earth is
(a) 3.84 × 108 m
(b) 3.84 × 108 km
(c) 1.5 ×108 km
(d) 6 × 108 m
10.
Multiple Choice
A cylindrical object of wood weighs 10 N on earth and 1.6 N on moon. Its mass is
(a) 1 kg
(b) 16 kg
(c) 8.4 kg
(d) 6.25 kg
11.
Multiple Choice
Which one is the right relation between density(D) and volume(V) of an object?
(a) D = V
(b) D ∝ V
(c) D ∝1/v
(d) D ∝1/v2
12.
Multiple Choice
A device which is used to measure the density of liquid is called?
(a)Thermometer .
(b) Lactometer .
(c) Hydrometer.
(d) Nanometer.
13.
Multiple Choice
The ratio of density of the substance to the density of water at 40c is called:
(a) Essential density.
(b) Liquid density.
(c) Proper density.
(d) Relative density.
14.
Multiple Choice
When upthrust is equal to weight of an object, it
(a) floats
(b) sinks
(c) moves
(d) stops
15.
Multiple Choice
Barometer is invented by
(a) Galileo
(b) Robert Boyle
(c) Charles
(d) Torricelli
16.
Multiple Choice
Which one is different among them?
(a) mc2
(b) hdg.
(c) 1/2mv2
(d) mgh
17.
Multiple Choice
Capacity of a body to do work is called
(a) energy
(b) work load
(c) kinetic energy
(d) potential energy
18.
Multiple Choice
Which of the following is the form of heat?
(a) energy
(b) force
(c) power
(d) resistance
19.
Multiple Choice
On Fahrenheit scale, upper fixed point is marked as
(a) 32 °F
(b) 212 °F
(c) 100 °F
(d) 0 °F
20.
Multiple Choice
Melting point of ice at Fahrenheit is
(a) 32 degree
(b) 100 degree
(c) 212 degree
(d) 75 degree
21.
Multiple Choice
Boiling point of liquid hydrogen is equal to −253 °C, which is equal to
(a) 373 K
(b) 20 K
(c) 273 K
(d) 100 K
22.
Multiple Choice
Amount of heat energy required to raise temperature of 1 kg of substance by 1 °C is termed as
(a) General Heat capacity
(b) Specific Heat Capacity
(c) Latent Heat
(d) Specific Latent Heat
23.
Multiple Choice
Between the melting point and boiling point at a substance is a .................. .
(a) Solid
(b) Liquid
(c) Gas
(d) Crystal
24.
Multiple Choice
Angle of incidence is equal to angle of ...................... .
(a) reflection
(b) refraction
(c) transmission
(d) incident
25.
Multiple Choice
Angle of reflection lies between reflected ray and ............. .
(a) normal line
(b) incident ray
(c) convergent ray
(d) all of them
26.
Multiple Choice
Ratio of speed of light in air ( vacuum) and speed of light in a medium is known as
(a) regular reflection
(b) reflective index
(c) refractive index
(d) regular refraction
27.
Multiple Choice
Power of a lens is defined as reciprocal of its ................... .
(a) focal length in meter
(b) principal axis
(c) optical centre
(d) vertex
28.
Multiple Choice
Study of light behavior is called
(a) lenses
(b) optics
(c) mechanics
(d) heat
29.
Multiple Choice
The image which cannot be obtained on the screen is called:
(a) imaginary image
(b) Real image
(c) inverted image
(d) Virtual image
30.
Multiple Choice
People with long-sightedness are treated by using .................... .
(a) concave lens
(b) convex lens
(c) lens
(d) none of them
31.
Multiple Choice
If the radius of curvature of a mirror is 20cm then the focal length is
(a) 20cm
(b) 10cm
(c) 40cm
(d) 5cm
32.
Multiple Choice
Which of the following has longest wavelength ?
(a) radio waves
(b) infrared
(c) ultraviolet
(d) gamma rays
33.
Multiple Choice
Which of the following is speed of light in vacuum ?
(a) 0.3 × 107 m/s
(b) 3 × 107 m/s
(c) 30 × 107 m/s
(d) 3 × 108 km/s
34.
Multiple Choice
When a person has hypermetropia, the image is formed
(a) in front of retina
(b) behind retina
(c) on blind spot
(d) none of them
35.
Multiple Choice
Electric current generates from which part of an atom?
(a) Nucleus
(b) Proton
(c) Electron
(d) Neutron
36.
Multiple Choice
Which on is converts chemical energy into electric energy?
(a) Solar cell
(b) generator
(c) Battery
(d) Nichrome wire
37.
Multiple Choice
According to the Ohm’s law, if resistance decreases and voltage stays the same then :
(a) resistance increases
(b) Current increases
(c) Current remains same
(d) Current decreases
38.
Multiple Choice
Which instrument is used to measure the resistance of electricity?
(a) ammeter
(b) voltmeter
(c) ohmmeter
(d) wattmeter
39.
Multiple Choice
A current of 2A flows through a 12V bulb then calculate the resistance .
(a) 24 Ohm
(b) 0.165 Ohm
(c) 6 Ohm
(d) 48 Ohm
40.
Multiple Choice
1 Ampere is equal to :
(a) 1 colb/1sec.
(b) 1 colb ×1sec
(c) 1 sec/1 colb
(d) None of above
41.
Multiple Choice
By which metal the filament of an electric bulb is made of?
(a) carbon
(b) Nichrome
(c) aluminium
(d) tungsten
42.
Multiple Choice
Nichrome wire is an alloy of :
(a) copper and silver
(b) nickel and chromium
(c) lead and Zinc
(d) nitrogen and chromium
43.
Multiple Choice
Which of the following is the source of electricity?
(a) Bulb
(b) Cell
(c) Transformer
(d) Voltmeter
44.
Multiple Choice
A short thin piece of wire which is heated up and melt by flowing of electric current in it, is called
(a) circuit
(b) fuse
(c) cell
(d) resistor
45.
Multiple Choice
In Nepal, frequency of alternating current is
(a) 40 Hz
(b) 50 Hz
(c) 60 Hz
(d) 70 Hz
46.
Multiple Choice
Adding common salt to distilled water makes it
(a) Good conductor
(b) Insulator
(c) Resistor
(d) Both a and b
47.
Multiple Choice
When water is electrolyzed, then which gas collected at cathode?
(a) sulphur
(b) oxygen
(c) hydrogen
(d) sulphur dioxide
48.
Multiple Choice
Abbreviation of 'MCB' is for
(a) moving circuit breaker
(b) manual current breaker
(c) manual circuit breaker
(d) miniature circuit breaker
49.
Multiple Choice
If secondary voltage is smaller than primary voltage, transformer is called as:
(a) positive transformer
(b) step-up transformer
(c) negative transformer
(d) step-down transformer
50.
Multiple Choice
What is the angle of dip at the magnetic pole of the earth?
(a) 00
(b) 450
(c) 900
(d) 1200
51.
Multiple Choice
Nichrome is known as
(a) lighting element
(b) heating element
(c) inert element
(d) active element
52.
Multiple Choice
Which of the following is source of current ?
(a) Ammeter
(b) Voltmeter
(c) Galvanometer
(d) Battery
53.
Multiple Choice
What is the SI unit of the ratio of quantity of charge “Q” and time “t” ?
(a) Volt
(b) Ampere
(c) Ohm
(d) Watt
54.
Multiple Choice
The formation of hydrogen layer on copper plate in dry cell is known as:
(a) local action
(b) polarization
(c) anode
(d) amalgamating
55.
Multiple Choice
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) 6 W
(b) 0.5 W
(c) 12W
(d) 24W
56.
Multiple Choice
Average distance between nucleus and outer shell is called ............. .
(a) atomic size
(b) nuclear size
(c) shielding effect
(d) none of above
57.
Multiple Choice
Which group of periodic table contains alkaline earth metal?
(a) IA
(b) IIIA
(c) IIA
(d) IVA
58.
Multiple Choice
Brass is an example of
(a) An alloy
(b) a compound
(c) a mixture
(d) an element
59.
Multiple Choice
When 4S orbital is complete, the entering electron goes into
(a) 5s
(b)5p
(c) 3d
(d) 4p
60.
Multiple Choice
Which of the following is the very light and inert gas?
(a) oxygen
(b) hydrogen
(c) helium
(d) neon
61.
Multiple Choice
How many number of neutrons (n0) in Atom of aluminum (Al)?
(a) 13
(b) 27
(c) 14
(d) 13
62.
Multiple Choice
A substance whose all atoms have same atomic number is ............. .
(a) molecule
(b) element
(c) atom
(d) ion
63.
Multiple Choice
All of these radicals have a valency of 2, except ............... .
(a) SO4
(b) CO3
(c) NH4
(d) SiO3
64.
Multiple Choice
All are covalent compounds except .................... .
(a) CH4
(b) C2H6
(c) CH3Cl
(d) NaCl
65.
Multiple Choice
Number of proton, neutron and electron in sulfide ion is respectively ....................... .
(a) 16,17 and 18
(b) 17,16 and 18
(c) 18,17 and 16
(d) 16,16 and 18
66.
Multiple Choice
When state of matter is changed from liquid to gas, we call it
(a) melting
(b) freezing
(c) boiling
(d) condensing
67.
Multiple Choice
The horizontal rows in a periodic table are called
(a) atomic structure
(b) periods
(c) actinides
(d) groups
68.
Multiple Choice
Which one is wrong statement?
(a) Number of neutrons = atomic mass – atomic number
(b) Atomic number = number of proton = number of electron
(c) Atomic number = atomic mass – numbers of neutron
(d) atomic mass = numbers of neutrons – atomic number
69.
Multiple Choice
From left to right in a period of periodic table proton number
(a) decrease
(b) neutral
(c) increase
(d) none
70.
Multiple Choice
NaOH + HCl →
(a) Na(OH)2 + H2
(b) NaCl + H2
(c) NaCl + H2O
(d) NaCl + H2 + O2
71.
Multiple Choice
To balance Al(OH)3 + HNO3 → Al(NO3)3 + H2O, number HNO3 molecules will be
(a) 1
(b) 2
(c) 3
(d) 4
72.
Multiple Choice
In Na2CO3, relative atomic mass of Oxygen is
(a) 12 amu
(b) 24 amu
(c) 36 amu
(d) 48 amu
73.
Multiple Choice
If atomic weight and proton number of an atom is 24 and 12 respectively, number of electrons and neutron will be
(a) 36,12
(b) 12,12
(c) 24,24
(d) 12,24
74.
Multiple Choice
If NaOH reacts with HCl, reaction can be known as
(a) combustion
(b) Thermal decomposition
(c) Neutralization
(d) Decomposition
75.
Multiple Choice
Phosphoric acid has formula .......... .
(a) H2PO3
(b) H2PO4
(c) H3PO4
(d) H3PO3
76.
Multiple Choice
In pH , the p is stand for :
(a) proton
(b) potential
(c) process
(d) primary
77.
Multiple Choice
Metal oxides are also called:
(a) acid oxides
(b) basic oxides
(c) neutral oxides
(d) none
78.
Multiple Choice
When acid reacts with metal carbonate, products are
(a) salt
(b) water
(c) carbon dioxide
(d) all of above
79.
Multiple Choice
Which one is not a base?
(a) NaOH
(b) HNO3
(c) Ca(OH)2
(d) NH4OH
80.
Multiple Choice
−78 °C is the….
(a) freezing point of carbon dioxide
(b) boiling point of carbon dioxide
(c) melting point of oxygen gas
(d) Both A and B
81.
Multiple Choice
Name a gas which is used in making chloroform?
(a) Methane
(b) Propane
(c) Butane
(d) Acetylene
82.
Multiple Choice
Which gas is produced when metal react with acids
(a) Oxygen
(b) Nitrogen
(c) Hydrogen
(d) Carbon dioxide
83.
Multiple Choice
What is dry ice?
(a) Solid Oxygen
(b) Solid Carbon Dioxide
(c) Solid Hydrogen
(d) Solid Nitrogen
84.
Multiple Choice
Ore of iron is ......................... .
(a) Haematite
(b) Chalcopyrite
(c) Bauxite
(d) Halite
85.
Multiple Choice
Which of the following is represent mercury(ii) ion correctly ?
(a) Hg --
(b) Hg ++
(c) Hg2 ++
(d) Hg2--
86.
Multiple Choice
Formula of tetra chloromethane is ................. .
(a) CCl4
(b) CH4Cl4
(c) C(HCl)4
(d) C4. HCl4
87.
Multiple Choice
Chloroform is also called
(a) Chloromethane
(b) Dichloromethane
(c) Trichloromethane
(d) Tetrachloromethane
88.
Multiple Choice
What is general formula of alkenes?
(a) CnH2n+2
(b) CnH2n
(c) CnH2n-2
(d) None of these
89.
Multiple Choice
If we remove one hydrogen (H) atom from alkane (saturated hydrocarbon), we get
(a) alkyl group
(b) alkene group
(c) alkyne group
(d) aldehyde group
90.
Multiple Choice
General formula for alcohol is
(a) R-OH
(b) R-O-R
(c) R-COOH
(d) R-NH2
91.
Multiple Choice
Ice floats on top of water because
(a) Water expands on freezing
(b) Water contracts on freezing
(c) Ice is lighter than iron
(d) None of these
92.
Multiple Choice
Insoluble salt is ..................... .
(a) Sodium Chloride
(b) Lead Chloride
(c) Magnesium Chloride
(d) Potassium hydroxide
93.
Multiple Choice
Solution of mercury with other metals is called
(a) amalgam
(b) sat urated solution
(c) supersaturated solution
(d) unsaturated solution
94.
Multiple Choice
What is molecular formula of sodamide?
(a) NaOH
(b) NH2CONH2
(c) NaNH2
(d) Ca(OH)2
95.
Multiple Choice
Oxygen is used in the production of which type of gas for welding and cutting?
(a) Propane
(b) Butane
(c) Acetylene
(d) Methane
96.
Multiple Choice
Solid solutions of metals are called
(a) alloys
(b) amalgams
(c) saturated solutions
(d) supersaturated solution
97.
Multiple Select
What is the chemical equation for the reaction that produces carbon dioxide from vinegar and baking soda?
(a) NaHCO3 + HCl → NaCl + H2O + CO2
(b) NaHCO3 + H2SO4 → Na2SO4 + H2O + CO2
(c) NaHCO3 + NaOH → Na2CO3 + H2O + CO2
(d) NaHCO3 + CH3COOH → NaCH3COO + H2O + CO2
98.
Multiple Choice
What is an example of a second-grade preservative?
(a) Sodium benzoate
(b) Salt
(c) Ascorbic acid
(d) Vinegar
99.
Multiple Choice
Methane' is an example of
(a) carbohydrates
(b) hydrocarbons
(c) alcohols
(d) alkenes
100.
Multiple Choice
Acetylene is another name of
(a) Ethyne
(b) Propene
(c) Butene
(d) Pentene
101.
Multiple Choice
What is physical state of first four alkanes?
(a) Solid
(b) Liquid
(c) Gas
(d) Plasma
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