1489 + Mcqs in Science Page 2 McqOptions

51.	Which planet does not have any moons?
A.	Venus
B.	Mars
C.	Jupiter
D.	Saturn
Answer» B. Mars

Discussion

52.	The lowest temperature at which a substance catch fire and starts burning is known as:
A.	Boiling point
B.	Calorific value
C.	Ignition temperature
D.	Both and
E.	None of these
Answer» D. Both and

Discussion

53.	Suppose you are in a car and there is a thunderstorm. Which of the following is the best way to protect yourself from possible harm?
A.	Remaining in the car
B.	Getting out of the car and taking cover under the car
C.	Running to a nearby tree
D.	Getting out and standing under an electric pole
Answer» B. Getting out of the car and taking cover under the car

Discussion

54.	This organism reproduces by sexual method, forming a heterokaryotic structure. It mostly grows on food particles and other eatables. Which one of the following microorganisms does the figure given below represents?
A.	Algae
B.	Fungus
C.	Virus
D.	Bacteria
E.	None of these
Answer» C. Virus

Discussion

55.	Which one of the following is correct about nylon fibers?
A.	Nylon fibres are very strong
B.	Nylon fibres absorbs very little water
C.	Nylon fibres are fairly elastic
D.	All of these
E.	None of these
Answer» E. None of these

Discussion

56.	Which of the following helps human beings in producing sounds?
A.	The eardrum
B.	The auditory nerve
C.	The optical cortex
D.	The vocal cords
Answer» E.

Discussion

57.	An object oscillates 50 times in one second. What is its frequency?
A.	0.2 Hz
B.	0.02 Hz
C.	0.002 Hz
D.	50 Hz
Answer» E.

Discussion

58.	A person, pressing his ear on the railway tracks can hear an approaching train. This is possible due to
A.	vibration of railway tracks
B.	vibration of air
C.	more speed of sound in solid medium
D.	hearing ability of the man
Answer» D. hearing ability of the man

Discussion

59.	Direction: Read the given paragraph and answer the following questions.Two metal rulers of lengths 30 cm and 60 cm are kept in such a manner that a 30 cm ruler extends about 15 cm over the edge and a 60 cm ruler extends about 30 cm over the edge. Both the ends are flicked.Which of the following statements is correct regarding this?(i) The metal ruler of length 30 cm is able to vibrate slower.(ii) The metal ruler of length 30 cm produces a high pitch sound.(iii) The metal ruler of length 60 cm is able to vibrate faster.(iv) The metal ruler of length 60 cm produces a low pitch sound.
A.	Only (i) and (iii) are correct.
B.	Only (ii) and (iv) are correct.
C.	Only (i) and (iv) are correct.
D.	Only (ii) and (iii) are correct.
Answer» C. Only (i) and (iv) are correct.

Discussion

60.	Fill in the blanks with the most appropriate option.If a guitar string is pulled strongly, its amplitude of vibration ___(i)___ and the note heard is ___(ii)___. If it is pulled lightly, its amplitude of vibration ___(iii)___ and the note heard is ___(iv)___.
A.	(i)(ii)(iii)(iv) IncreasesLouderIncreasesLouder
B.	(i)(ii)(iii)(iv) DecreasesSofterDecreasesSofter
C.	(i)(ii)(iii)(iv) IncreasesLouderDecreasesSofter
D.	(i)(ii)(iii)(iv) DecreasesSofterIncreasesLouder
Answer» D. (i)(ii)(iii)(iv) DecreasesSofterIncreasesLouder

Discussion

61.	Periscope works on the principle of multiple reflections. It consists of two or more mirror, used for the reflection. If the two mirrors are placed at an angle of 90°, how many images of the object are formed between them?
A.	One
B.	Two
C.	Three
D.	Four
E.	None of these
Answer» D. Four

Discussion

62.	Which of the following is the first Indian satellite?
A.	INSAT
B.	Aryabhatta
C.	Bhaskara
D.	APPLE
Answer» C. Bhaskara

Discussion

63.	Flash and thunder are produced simultaneously. But thunder is heard a few seconds after the flash is seen. This is because
A.	speed of sound is greater than speed of light
B.	speed of sound is equal to the speed of light
C.	speed of light is much greater than the speed of sound
D.	none of these.
Answer» D. none of these.

Discussion

64.	What is the nature of the oxide which is formed when a non-metal reacts with oxygen?
A.	Basic
B.	Acidic
C.	Neutral
D.	All of these
E.	None of these
Answer» C. Neutral

Discussion

65.	Red blood cells do not have: (i) Cell membrane (ii) Cytoplasm (iii) Plastid (iv) Nucleus
A.	(i) and (ii)
B.	(ii) and (iii)
C.	(iii) and (iv)
D.	(i) and (iv)
E.	None of these
Answer» D. (i) and (iv)

Discussion

66.	Earthquakes at two places M and N were measured as 2 and 4. How is the magnitude and their destructive energy at M and N related?
A.	Tremor at N is strong as that at place ?M?
B.	Tremor at N is four times stronger than that at place 'M?.
C.	Tremor at N is 100 times stronger than that at place 'M?.
D.	Tremor at N is 1000 times stronger than that at place ?M?.
Answer» D. Tremor at N is 1000 times stronger than that at place ?M?.

Discussion

67.	In which medium sound travel fastest
A.	solid
B.	liquid
C.	gas
D.	vacuum
Answer» B. liquid

Discussion

68.	Which part of the earth consists of tectonic plates?
A.	Crust
B.	Mantle
C.	Inner core
D.	Outer core
E.	None of these
Answer» B. Mantle

Discussion

69.	The distance between the observer (source of sound) and wall is 500 m. The observer hear the first echo after 2 sec then velocity of the sound is
A.	250 m/s
B.	500 m/s
C.	750 m/s
D.	1000 m/s
Answer» C. 750 m/s

Discussion

70.	Match the following table: Constellations Common Name (1) Ursa major Queen C (2) Orion Lion (3) Leo major Mriga (4) Cassiopeia Saptarishi
A.	1-B, 2-C, 3-D, 4-A
B.	1-D, 2-C, 3-B, 4-A
C.	1-A, 2-D, 3-B, 4-C
D.	1-D, 2-A, 3-B, 4-C
E.	None of these
Answer» C. 1-A, 2-D, 3-B, 4-C

Discussion

71.	Which fundamental particle in an atom has no charge?
A.	Electron
B.	Proton
C.	Neutron
D.	Both (A) and (B)
Answer» D. Both (A) and (B)

Discussion

72.	How does a whistle produce sound?
A.	The body of whistle stores air.
B.	The air vibrates.
C.	The person produces vibrations.
D.	All of the above
Answer» C. The person produces vibrations.

Discussion

73.	When we inflate the balloons with air, we find that its size increases. The large number of gas molecule collides with each other and creates large:
A.	Force
B.	Pressure
C.	Increase in size
D.	Increase in mass
E.	None of these
Answer» C. Increase in size

Discussion

74.	Frequency of a body is 10 Hz, then range is
A.	ultrasonic
B.	infrasonic
C.	audible
D.	decible (dB)
Answer» C. audible

Discussion

75.	The time period of simple pendulum is 0.2 sec. what is its frequency of oscillation?
A.	0.5 Hz
B.	5 Hz
C.	50 Hz
D.	1 Hz
Answer» C. 50 Hz

Discussion

76.	Why is it not advisable to wear clothes made up of synthetic fibres in hot and humid weather?
A.	Synthetic fibres catch fire very easily.
B.	Synthetic fibres do not absorb sweat.
C.	Synthetic fibres stick to the body.
D.	Both (b) and (c).
Answer» E.

Discussion

77.	Identify the shaded region in the given figure below.
A.	Compression
B.	Rarefaction
C.	Diversion
D.	Echo
E.	None of these
Answer» B. Rarefaction

Discussion

78.	Which one of the following is used as reducing agents in the extraction of metals?
A.	Coal gas
B.	Coal tar
C.	Coke
D.	All of these
E.	None of these
Answer» D. All of these

Discussion

79.	A positively charged object attracts another charged object kept close to it. What is the nature of charge on the other object?
A.	Neutral
B.	Negative
C.	Positive
D.	Active
E.	None of these
Answer» C. Positive

Discussion

80.	A huge wave that occurs due to an earthquake under the sea floor is:
A.	Magma
B.	Mantle
C.	Tsunami
D.	Cyclone
E.	None of these
Answer» D. Cyclone

Discussion

81.	Lightning conductor device was invented by:
A.	Isaac Newton
B.	Alexander Fleming
C.	Benjamin Franklin
D.	Thomas Alva Edison
E.	None of these
Answer» D. Thomas Alva Edison

Discussion

82.	Which of the following applications of plastics show(s) that plastics are bad conductors of electricity? I. Refrigerators have an insulating wool of plastics. II. Electric wires have a plastic coating. III. Chemicals are stored in plastic containers. IV. Parachutes are made from plastics.
A.	II, III and IV only
B.	III and IV only
C.	I only
D.	II only
Answer» E.

Discussion

83.	The hearing range of human ear is
A.	20 Hz to 20, 000 Hz
B.	less than 20 Hz
C.	more than 20,000
D.	20,00 Hz to 25, 000 Hz
Answer» B. less than 20 Hz

Discussion

84.	Match the column I with the column II and select the correct option.Column IColumn II(a) Electrically neutral particle(i) Copper(b) The charges acquired by a glass rod rubbed with silk cloth(ii) Neutron(c) Unlike charges(iii) Positive(d) Lightning rod(iv) Attract each other
A.	(a) - (i), (b) - (ii), (c) - (iii), (d) - (iv)
B.	(a) - (ii), (b) - (iii), (c) - (iv), (d) - (i)
C.	(a) - (iii), (b) - (iv), (c) - (i), (d) - (ii)
D.	(a) - (iv), (b) - (i), (c) - (ii), (d) - (iii)
Answer» C. (a) - (iii), (b) - (iv), (c) - (i), (d) - (ii)

Discussion

85.	In the given figure, layers of Earth are shown. Identify A, B, C and D respectively, and choose the correct option.
A.	A B C D Outer core Mantle Crust Inner core
B.	A B C D Inner core Outer core Mantle Crust
C.	A B C D Mantle Crust Inner core Outer core
D.	A B C D Crust Mantle Inner core Outer core
Answer» C. A B C D Mantle Crust Inner core Outer core

Discussion

86.	____ takes place between unlike charges.
A.	Repulsion
B.	Attraction
C.	Reflection
D.	Divergence
E.	None of these
Answer» C. Reflection

Discussion

87.	An earthquake is a:
A.	Volcanic eruption
B.	Thunderstorm
C.	Sudden shaking of earth
D.	Fast rotation of earth
E.	None of these
Answer» D. Fast rotation of earth

Discussion

88.	Where do you find the ?sea of tranquility"?
A.	On the surface of moon
B.	On the surface of earth
C.	On the surface of Mercury
D.	On the surface of Mars
Answer» B. On the surface of earth

Discussion

89.	Which of the given planets is the brightest?
A.	Mercury
B.	Venus
C.	Mars
D.	Jupiter
Answer» C. Mars

Discussion

90.	Which one of the following pairs of planets is known as gas giants?
A.	Saturn and Mars
B.	Venus and Mercury
C.	Venus and Neptune
D.	Saturn and Jupiter
Answer» E.

Discussion

91.	By which of these processes is polythene produced?
A.	Isomerization
B.	Polymerization
C.	Hydrogenation
D.	All of the above
Answer» C. Hydrogenation

Discussion

92.	The frequency of a source is 15 kHz. What will be the frequency of the sound wave produced by it in water and air?
A.	It is the same as that of the source.
B.	Frequency in water will be more than that in air.
C.	Frequency in air will be more than that in water.
D.	Depends upon the velocities of sound in these media.
Answer» C. Frequency in air will be more than that in water.

Discussion

93.	Which one of the following statements is correct? Statement 1: A biosphere reserve may also contains wildlife sanctuary and national park Statement 2: There are 14 biosphere reserves in India
A.	Statement 1
B.	Statement 2
C.	Both statements are correct
D.	Both statements are incorrect
Answer» D. Both statements are incorrect

Discussion

94.	Read the given statements and select the correct option. Statement 1: It is easier to generate static electricity on cold, dry winter days than on warm, humid days. Statement 2: Moisture present in the air carries away charges from the charged surface.
A.	Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1.
B.	Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1.
C.	Statement 1 is true but statement 2 is false.
D.	Both statements 1 and 2 are false.
Answer» B. Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1.

Discussion

95.	When we immerse a spoon in a glass containing water, it appears bent at the point, it enters in the water. This apparent bending of the spoon is due to _______.
A.	Reflection
B.	Refraction
C.	Dispersion
D.	Conversion
E.	None of these
Answer» C. Dispersion

Discussion

96.	Which of the following is NOT a natural polymer?
A.	Natural rubber
B.	Polyester
C.	Protein
D.	Starch
Answer» C. Protein

Discussion

97.	There are different methods of reproduction in the microorganisms. For example. Amoeba reproduces by the binary fission. The microorganisms, which reproduce only inside the cell of the host organism is:
A.	Diatoms
B.	Flagella
C.	Virus
D.	Rizophous
E.	None of these
Answer» D. Rizophous

Discussion

98.	Which of the following commonly known as shooting star?
A.	Asteroid
B.	Comet
C.	Meteor
D.	Constellation
E.	None of these
Answer» D. Constellation

Discussion

99.	By which of the following ways an uncharged body can be charged by not touching it with the charged body?
A.	Charging by induction
B.	Charging by conduction
C.	Charging by friction
D.	Both [b] and [c]
E.	None of these
Answer» B. Charging by conduction

Discussion

100.	The brightest planet of the solar system is _____.
A.	Mercury
B.	Venus
C.	Earth
D.	Mars
E.	None of these
Answer» C. Earth

Discussion

Explore topic-wise MCQs in 8th Class.

Which planet does not have any moons?

The lowest temperature at which a substance catch fire and starts burning is known as:

Suppose you are in a car and there is a thunderstorm. Which of the following is the best way to protect yourself from possible harm?

This organism reproduces by sexual method, forming a heterokaryotic structure. It mostly grows on food particles and other eatables. Which one of the following microorganisms does the figure given below represents?

Which one of the following is correct about nylon fibers?

Which of the following helps human beings in producing sounds?

An object oscillates 50 times in one second. What is its frequency?

A person, pressing his ear on the railway tracks can hear an approaching train. This is possible due to

Fill in the blanks with the most appropriate option.If a guitar string is pulled strongly, its amplitude of vibration ___(i)___ and the note heard is ___(ii)___. If it is pulled lightly, its amplitude of vibration ___(iii)___ and the note heard is ___(iv)___.

Periscope works on the principle of multiple reflections. It consists of two or more mirror, used for the reflection. If the two mirrors are placed at an angle of 90°, how many images of the object are formed between them?

Which of the following is the first Indian satellite?

Flash and thunder are produced simultaneously. But thunder is heard a few seconds after the flash is seen. This is because

What is the nature of the oxide which is formed when a non-metal reacts with oxygen?

Red blood cells do not have: (i) Cell membrane (ii) Cytoplasm (iii) Plastid (iv) Nucleus

Earthquakes at two places M and N were measured as 2 and 4. How is the magnitude and their destructive energy at M and N related?

In which medium sound travel fastest

Which part of the earth consists of tectonic plates?

The distance between the observer (source of sound) and wall is 500 m. The observer hear the first echo after 2 sec then velocity of the sound is

Match the following table: Constellations Common Name (1) Ursa major Queen C (2) Orion Lion (3) Leo major Mriga (4) Cassiopeia Saptarishi

Which fundamental particle in an atom has no charge?

How does a whistle produce sound?

When we inflate the balloons with air, we find that its size increases. The large number of gas molecule collides with each other and creates large:

Frequency of a body is 10 Hz, then range is

The time period of simple pendulum is 0.2 sec. what is its frequency of oscillation?

Why is it not advisable to wear clothes made up of synthetic fibres in hot and humid weather?

Identify the shaded region in the given figure below.

Which one of the following is used as reducing agents in the extraction of metals?

A positively charged object attracts another charged object kept close to it. What is the nature of charge on the other object?

A huge wave that occurs due to an earthquake under the sea floor is:

Lightning conductor device was invented by:

Which of the following applications of plastics show(s) that plastics are bad conductors of electricity? I. Refrigerators have an insulating wool of plastics. II. Electric wires have a plastic coating. III. Chemicals are stored in plastic containers. IV. Parachutes are made from plastics.

The hearing range of human ear is

Match the column I with the column II and select the correct option.Column IColumn II(a) Electrically neutral particle(i) Copper(b) The charges acquired by a glass rod rubbed with silk cloth(ii) Neutron(c) Unlike charges(iii) Positive(d) Lightning rod(iv) Attract each other

In the given figure, layers of Earth are shown. Identify A, B, C and D respectively, and choose the correct option.

____ takes place between unlike charges.

An earthquake is a:

Where do you find the ?sea of tranquility"?

Which of the given planets is the brightest?

Which one of the following pairs of planets is known as gas giants?

By which of these processes is polythene produced?

The frequency of a source is 15 kHz. What will be the frequency of the sound wave produced by it in water and air?

Which one of the following statements is correct? Statement 1: A biosphere reserve may also contains wildlife sanctuary and national park Statement 2: There are 14 biosphere reserves in India

Read the given statements and select the correct option. Statement 1: It is easier to generate static electricity on cold, dry winter days than on warm, humid days. Statement 2: Moisture present in the air carries away charges from the charged surface.

When we immerse a spoon in a glass containing water, it appears bent at the point, it enters in the water. This apparent bending of the spoon is due to _______.

Which of the following is NOT a natural polymer?

There are different methods of reproduction in the microorganisms. For example. Amoeba reproduces by the binary fission. The microorganisms, which reproduce only inside the cell of the host organism is:

Which of the following commonly known as shooting star?

By which of the following ways an uncharged body can be charged by not touching it with the charged body?

The brightest planet of the solar system is _____.

Fill in the blanks with the most appropriate option.If a guitar string is pulled strongly, its amplitude of vibration _(i)_ and the note heard is _(ii)_. If it is pulled lightly, its amplitude of vibration _(iii)_ and the note heard is _(iv)_.