Q:

Which one of the following gases dissolves in water to give acidic solution?

A) Carbon dioxide	B) Oxygen
C) Nitrogen	D) Hydrogen

Answer & Explanation Answer: A) Carbon dioxide

Explanation:

Carbon dioxide (CO2) gas dissolved in water can cause water to become acidic.The acidity of water from dissolved CO2 can be reduced by a base such as baking soda (sodium bicarbonate).

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Q:

What are the main components of Brass Alloy?

A) Copper and Zinc	B) Copper and Strontium
C) Copper, Zinc and Nickel	D) Copper and Nickel

Answer & Explanation Answer: A) Copper and Zinc

Explanation:

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Q:

The conversion of hard water into soft water by boiling or adding calcium hydroxide is called _______.

A) Baker's process	B) Temp's process
C) Clarke's process	D) Lake's process

Answer & Explanation Answer: C) Clarke's process

Explanation:

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Q:

_______ are chlorophyll-bearing, simple, thalloid, autotrophic and largely acquatic (both fresh water and marine) organisms.

A) Pteridophytes	B) Bryophytes
C) Algae	D) Gymnosperms

Answer & Explanation Answer: C) Algae

Explanation:

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Q:

The partnership form of business organization is

A) only two shares	B) more than two shares
C) no share	D) doesn't exist

Answer & Explanation Answer: B) more than two shares

Explanation:

A partnership is a form of business where two or more people share ownership.

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Q:

1kWH = .........J

A) 3.6×10^-8	B) 3.6×10^-6
C) 3.6×10^8	D) 3.6×10^6

Answer & Explanation Answer: D) 3.6×10^6

Explanation:

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Q:

If the wavelengths corresponding to ultraviolet, visible and infrared radiations are given as lUV, lVIS and lIR respectively, then which of the following gives the correct relationship among these wavelengths?

A) lUV < lIR < lVIS	B) lUV > lVIS > lIR
C) lUV > lIR > lVIS	D) lUV < lVIS < lIR

Answer & Explanation Answer: D) lUV < lVIS < lIR

Explanation:

Infrared radiation, what we experience as heat when we hold our hand near a warm object, is somewhat longer wavelengths than visible light. Visible light is simply electromagnetic radiation in a range of wavelengths that our eyes are sensitive to. Visible wavelengths range from 0.0007 milimeters for red light, through orange, yellow, green, and blue, to 0.0004 milimeters for violet light. Ultraviolet is shorter wavelengths than violet.

Longer the wavelength,lower the energy

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Q:

What is the SI unit of Torque?

A) newton/meter	B) newton meter
C) newton second	D) newton/meter squared

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