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Q:

Three solid spheres of radius 3 cm, 4 cm and 5 cm are melted and recasted into a solid sphere. What will be the percentage decrease in the surface area?

A) 12 B) 14
C) 16 D) 28
 
Answer & Explanation Answer: D) 28

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Filed Under: Volume and Surface Area
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Q:

If there are four lines in a plane, then what cannot be the number of points of intersection of these lines?

A) 0 B) 5
C) 4 D) 7
 
Answer & Explanation Answer: D) 7

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Filed Under: Volume and Surface Area
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Q:

Which one of the following is not a property of electromagnetic waves?

A) Electromagnetic waves do not show interference and diffraction. B) Oscillating electric field and magnetic field are perpendicular to each other.
C) Electromagnetic waves are transverse waves D) Electromagnetic waves do not require a medium to propagate.
 
Answer & Explanation Answer: A) Electromagnetic waves do not show interference and diffraction.

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Filed Under: Physics
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Q:

To whom the Nobel Prize in Physiology or Medicine 2016 was awarded?

A) David J. Thouless B) Yoshinori Ohsumi
C) J. Michael Kosterlitz D) Sir J. Fraser Stoddart
 
Answer & Explanation Answer: B) Yoshinori Ohsumi

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Filed Under: Honours and Awards
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Q:

The ozone layer protects us from harmful _______________ rays of the sun.

A) infrared B) cosmic
C) gamma D) ultraviolet
 
Answer & Explanation Answer: D) ultraviolet

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Filed Under: General Science
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Q:

The ratio of the present ages of Reena and her husband is 4 : 5. 8 years from now, ages of her husband and her son will be in the ratio 24 : 9. If the present age of Reena is 32 years, then what will be her son’s present age (in years)?

 

A) 12 B) 15
C) 10 D) 8
 
Answer & Explanation Answer: C) 10

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Filed Under: Problems on Ages
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Q:

If an object is placed at the center of curvature of a concave mirror, then the image formed will be

A) virtual and enlarged B) virtual and diminished
C) real and of the same size D) real and enlarged
 
Answer & Explanation Answer: C) real and of the same size

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Filed Under: Physics
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Q:

How many natural numbers between 15 and 85 are divisible by 7?

A) 9 B) 10
C) 8 D) 7
 
Answer & Explanation Answer: B) 10

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Filed Under: Problems on Numbers
Exam Prep: Bank Exams

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