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Q:

If the acceleration due to gravity on the surface of earth is g, then the acceleration due to gravity on the surface of a planet whose mass is half of that of earth and radius is same as that of earth is _________________.

 

A) g/2 B) 4g
C) 2g   D) g/4
 
Answer & Explanation Answer: A) g/2

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Q:

The centre of the reflecting surface of a spherical mirror is a point called the ___.

A) pole B) focus
C) radius D) aperature
 
Answer & Explanation Answer: A) pole

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Q:

A solar eclipse occurs when

A) moon comes in the middle of sun and earth B) sun comes in the middle of moon and earth
C) earth comes in the middle of moon and sun D) All of the above
 
Answer & Explanation Answer: A) moon comes in the middle of sun and earth

Explanation:

A solar eclipse happens when the moon gets in the way of the sun's light and casts its shadow on Earth. Solar eclipses happen when the New Moon comes between the Sun and Earth and blocks out the Sun's rays.

 

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Q:

What is the type of Energy possessed by a stretched rubber band?

A) Potential energy B) Kinetic energy
C) Chemical energy D) Thermal energy
 
Answer & Explanation Answer: D) Thermal energy

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Q:

In a hydrogen atom, an electron moves in an orbit of radius 5.0 x 10-11 m with a speed of 2.2 x 106 m/s. What is the equivalent current? (Electronic charge = 1.6 x10-19 C)

 

 

A) 0.112 mA B) 112 mA
C) 11.2 mA D) 1.12 mA
 
Answer & Explanation Answer: D) 1.12 mA

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Q:

For what is Radiocarbon dating technique used?

A) To estimate soil contamination B) To estimate the amount of water in fossils
C) To estimate the age of fossils D) To estimate the quality of soil
 
Answer & Explanation Answer: C) To estimate the age of fossils

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Q:

Sensitivity of potentiometer can be increased by

A) increasing the e.m.f. of the cell B) increasing the length of the potentiometer
C) decreasing the length of the potentiometer wire D) none of these
 
Answer & Explanation Answer: B) increasing the length of the potentiometer

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Q:

___ is a unit of length, roughly the distance from Earth to the Sun.

A) Light years B) Astronomical unit
C) Kelvin D) Joule
 
Answer & Explanation Answer: B) Astronomical unit

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