CBSE Class 8 Science – MCQ and Online Tests – Unit 15 – Some Natural Phenomena
Every year CBSE students attend Annual Assessment exams for 6,7,8,9,11th standards. These exams are very competitive to all the students. So our website provides online tests for all the 6,7,8,9,11th standards’ subjects. These tests are also very effective and useful for those who preparing for any competitive exams like Olympiad etc. It can boost their preparation level and confidence level by attempting these chapter wise online tests.
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CBSE Class 8 Science – MCQ and Online Tests – Unit 15 – Some Natural Phenomena
Choose the correct option in the following questions:
Question 1.
Which is the surest test of charge on a body?
(a) Repulsion
(b) Lightning
(c) Combustion
(d) Insulation
Answer
Answer: (a) Repulsion
Question 2.
A device used to test whether an object is carrying charge or not is called ______.
(a) Electrometer
(b) Charge meter
(c) Electroscope
(d) Chargoscope
Answer
Answer: (c) Electroscope
Question 3.
Which of the following can be charged with static electricity ?
(a) Metal
(b) Alloy
(c) Insulator
(d) Semiconductor
Answer
Answer: (c) Insulator
Question 4.
Where is the lightning rod attached to protect the building from lightning?
(a) On the top of the building
(b) On the bottom of the building
(c) In the middle of the building
(d) All of these
Answer
Answer: (a) On the top of the building
Question 5.
Lightning always follows
(a) a thunder
(b) rain pour
(c) the easiest path
(d) a straight path
Answer
Answer: (a) a thunder
Question 6.
Tsunami means
(a) earthquake
(b) floods
(c) earthquake under the sea
(d) eruption of volcano in a sea
Answer
Answer: (c) earthquake under the sea
Question 7.
The waves produced on the earth’s surface is called
(a) seismic wave
(b) longitudinal wave
(c) Micro wave
(d) Radio wave
Answer
Answer: (a) seismic wave
Question 8.
Amber is a
(a) metal
(b) rubber
(c) resin
(d) sugar
Answer
Answer: (c) resin
Question 9.
Seismograph is an instrument used to
(a) Record strength of wind
(b) Record vibrations of earthquake
(c) Record lightening
(d) Record temperature
Answer
Answer: (b) Record vibrations of earthquake
Question 10.
The power of an earthquake is expressed in terms of magnitude on a scale called
(a) Righter Scale
(b) Quake scale
(c) Richter Scale
(d) Earth Scale
Answer
Answer: (c) Richter Scale
Question 11.
Which of the following occurs during lightning?
(a) Acid rain
(b) Nitrogen fixation
(c) Green house effect
(d) Earthing
Answer
Answer: (b) Nitrogen fixation
Question 12.
Which of the following can be charged by rubbing?
(a) Ebonite
(b) Plastic
(c) Amber
(d) All of these
Answer
Answer: (d) All of these
Question 13.
When two bodies are rubbed against each other, they acquire
(a) equal and like charges
(b) equal and unlike charges
(c) unequal and like charges
(d) unequal and unlike charges
Answer
Answer: (b) equal and unlike charges
Question 14.
It is a convention to call the charge acquired by a glass rod when it is rubbed with silk as __________
(a) Negative
(b) Positive
(c) Neutral
(d) Can be any one
Answer
Answer: (b) Positive
Question 15.
The process of transfer of charges from a charged object to the earth is called
(a) earthing
(b) lightning
(c) oscillation motion
(d) electron movement
Answer
Answer: (a) earthing
Question 16.
The power of an earthquake is expressed on a scale called
(a) seismic scale
(b) iron scale
(c) richter scale
(d) large scale
Answer
Answer: (c) richter scale
Question 17.
During lightning actually _____________ takes place
(a) Electric discharge
(b) Electric charging
(c) Electric charge accumulation
(d) All of the above
Answer
Answer: (a) Electric discharge
Question 18.
During a thunderstorm which action may be done?
(a) Using Telephone having cord
(b) Switching on / off electric lights
(c) Using a mobile phone
(d) None of the above
Answer
Answer: (c) Using a mobile phone
Question 19.
To protect tall buildings from the damage of lightning, what can be done?
(a) Not to build tall buildings
(b) Install lightning conductors
(c) Install many TV antennas
(d) Have a roof top garden with tall trees
Answer
Answer: (b) Install lightning conductors
Question 20.
A major earthquake occurred on 26th January 2001 in which part of India?
(a) Uri (Kashmir)
(b) Mumbai (Maharastra)
(c) Guwahati (Assam)
(d) Bhuj (Gujarat)
Answer
Answer: (d) Bhuj (Gujarat)
Question 21.
During thunderstorm it is safer to
(a) Carry an open umbrella
(b) Take shelter under short trees
(c) Take shelter under tall trees
(d) Stand in open fields
Answer
Answer: (b) Take shelter under short trees
Question 22.
The process of transferring charge from a charged body to earth is called
(a) transferring
(b) Processing
(c) Charging
(d) Earthing
Answer
Answer: (d) Earthing
Question 23.
Which instrument is used to measure earthquake?
(a) Richter scale
(b) Seismograph
(c) Polygraph
(d) None of these
Answer
Answer: (b) Seismograph
Question 24.
Which is not a natural phenomena?
(a) Earthquakes
(b) Cyclones
(c) Lightning
(d) Earthing
Answer
Answer: (d) Earthing
Question 25.
How many types of charges are gained by rubbing objects?
(a) 2
(b) 1
(c) 3
(d) 4
Answer
Answer: (a) 2
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