DAY – 10: Insights Self Study Guide for Prelims + Mains – 2015
10 June 2015
Following Questions are Based on this TIMETABLE
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NCERT Class VIII Science Chapter – 18
Multiple Choice Questions Quiz
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Welcome to the New initiative. The following questions are based on the topics we have given in this Timetable. For more challenging question papers (Full Length), please join our Preliminary Exam – 2015 Test Series (Please Click Here for Reviews)
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Question 1 of 14
1. Question
Consider the following statements:
- In humans, adolescence begins around the age of 11 and lasts up to 18 or 19 years of age
- The growth of larynx results in cracking of voice during adolescence
- Girls have a high pitched voice, whereas boys have a deep voice
Which of the above statements is/are INCORRECT?
Correct
Solution: d)
NCERT Class VIII, Chapter – 10
Incorrect
Solution: d)
NCERT Class VIII, Chapter – 10
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Question 2 of 14
2. Question
Consider the following statements
- Thyroid and adrenal glands release their secretions through ducts
- Endocrine glands release hormones directly into the bloodstream
Which of the above statements is/are correct?
Correct
Solution: b)
Thyroid and adrenal are endocrine glands. Salivary, sweat and oil glands release their secretions through ducts.
NCERT Class VIII, Chapter – 10
Incorrect
Solution: b)
Thyroid and adrenal are endocrine glands. Salivary, sweat and oil glands release their secretions through ducts.
NCERT Class VIII, Chapter – 10
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Question 3 of 14
3. Question
Consider the following statements:
- Chromosomes are made from long DNA molecules
- The unfertilised egg always has two X chromosomes
- A gene is nothing but a short section of a DNA
Which of the above statements is/are correct?
Correct
Solution: b)
NCERT Class VIII, Chapter – 10
http://www.bbc.co.uk/schools/gcsebitesize/science/add_aqa_pre_2011/celldivision/celldivision1.shtml
Incorrect
Solution: b)
NCERT Class VIII, Chapter – 10
http://www.bbc.co.uk/schools/gcsebitesize/science/add_aqa_pre_2011/celldivision/celldivision1.shtml
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Question 4 of 14
4. Question
Consider the following statements:
- Growth hormone (GH or HGH) is a peptide hormone that stimulates growth, cell reproduction and regeneration in humans and other animals
- Growth Hormone is synthesised in the pituitary gland
- Somatropin is a natural growth harmone widely used in medical applications
Which of the above statements is/are correct?
Correct
Solution: a)
http://www.news-medical.net/health/What-are-Growth-Hormones.aspx
NCERT Class VIII, Chapter – 10
Incorrect
Solution: a)
http://www.news-medical.net/health/What-are-Growth-Hormones.aspx
NCERT Class VIII, Chapter – 10
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Question 5 of 14
5. Question
Consider the following statements:
- The moving ball comes to rest due to the force of friction
- The force of friction always acts on all the moving objects and its direction is always opposite to the direction of motion
Which of the above statements is/are correct?
Correct
Solution: c)
NCERT Class VIII, Chapter – 11
Incorrect
Solution: c)
NCERT Class VIII, Chapter – 11
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Question 6 of 14
6. Question
Which of the following forces are non-contact forces?
- Electrostatic force
- Gravity
- Weak nuclear force
- Tension
- Magnetic force
Choose the correct answer using the codes below
Correct
Solution: d)
NCERT Class VIII, Chapter – 11
Incorrect
Solution: d)
NCERT Class VIII, Chapter – 11
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Question 7 of 14
7. Question
Four children were asked to arrange forces due to rolling, static and sliding frictions in a decreasing order. Their arrangements are given below. Choose the correct arrangement
Correct
Solution: c)
NCERT Class VIII, Chapter – 12
Incorrect
Solution: c)
NCERT Class VIII, Chapter – 12
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Question 8 of 14
8. Question
Consider the following statements:
- The sound cannot travel through vacuum
- Sound travels faster in solids than in liquids
- sound wave in air and in any fluid medium is a transverse wave
Which of the above statements is/are correct
Correct
Solution: d)
Sound waves are longitudinal waves. It is because of this they travel faster in solids.
Why? Please read this:
http://www.physlink.com/Education/AskExperts/ae20.cfm
http://www.physicsclassroom.com/class/sound/Lesson-1/Sound-as-a-Longitudinal-Wave
NCERT Class VIII, Chapter – 13
Incorrect
Solution: d)
Sound waves are longitudinal waves. It is because of this they travel faster in solids.
Why? Please read this:
http://www.physlink.com/Education/AskExperts/ae20.cfm
http://www.physicsclassroom.com/class/sound/Lesson-1/Sound-as-a-Longitudinal-Wave
NCERT Class VIII, Chapter – 13
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Question 9 of 14
9. Question
Consider the following statements:
- Frequency is expressed in hertz
- The frequency determines the loudness of a sound
- The amplitude determines the shrillness or pitch of a sound
- A drum produces low-pitched sound because of its low amplitude vibrations
Which of the above statements is/are INCORRECT?
Correct
Solution: c)
The loudness of sound depends on its amplitude. When the amplitude of vibration is large, the sound produced is loud. When the amplitude is small, the sound produced is feeble.
The frequency determines the shrillness or pitch of a sound. If the frequency of vibration is higher we say that the sound is shrill and has a higher pitch. If the frequency of vibration is lower, we say that the sound has a lower pitch. For example, a drum vibrates with a low frequency. Therefore, it produces a low-pitched sound.
NCERT Class VIII, Chapter – 13
Incorrect
Solution: c)
The loudness of sound depends on its amplitude. When the amplitude of vibration is large, the sound produced is loud. When the amplitude is small, the sound produced is feeble.
The frequency determines the shrillness or pitch of a sound. If the frequency of vibration is higher we say that the sound is shrill and has a higher pitch. If the frequency of vibration is lower, we say that the sound has a lower pitch. For example, a drum vibrates with a low frequency. Therefore, it produces a low-pitched sound.
NCERT Class VIII, Chapter – 13
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Question 10 of 14
10. Question
Consider the following statements:
- The passage of an electric current through a conducting solution causes chemical reactions
- Electroplating of iron with zinc is done to protect it from corrosion and formation of rust
Which of the above statements is/are correct?
Correct
Solution: c)
NCERT Class VIII, Chapter – 14
Incorrect
Solution: c)
NCERT Class VIII, Chapter – 14
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Question 11 of 14
11. Question
Consider the following statements:
- Electroscope is used to test whether an object is carrying charge or not
- The process of transferring of charge from a charged object to the earth is called earthing
Which of the above statements is/are INCORRECT?
-
Question 12 of 14
12. Question
Rainbow is a natural phenomenon showing
Correct
Solution: b)
NCERT Class VIII, Chapter – 16
Incorrect
Solution: b)
NCERT Class VIII, Chapter – 16
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Question 13 of 14
13. Question
Consider the following statements:
- The Blind Spot in eye is located within the retina
- The impression of an image persists in the retina for about 1/16th of a second
Which of the above statements is/are correct?
Correct
Solution: c)
NCERT Class VIII, Chapter – 16
Incorrect
Solution: c)
NCERT Class VIII, Chapter – 16
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Question 14 of 14
14. Question
Consider the following statements:
- The distance travelled by light in one year is known as light year
- The distance of the Sun from the Earth may be said to be about 8 light minutes
Which of the above statements is/are INCORRECT?
Correct
Solution: d)
NCERT Class VIII, Chapter – 16
Incorrect
Solution: d)
NCERT Class VIII, Chapter – 16
