A moderator is used in nuclear reactor in order to ...? Mcqs

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A moderator is used in nuclear reactor in order to ...?

(A) Accelerate the neutrons
(B) Slow down the speed of the neutrons

(C) Increase the number of elections
(D) Decrease the number of electrons

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The hard, solid rocks, whose composition or texture has been changed by heat or pressure in the Earth are called____________...?

(A) Sedimentary rocks
(B) Metamorphic rocks

(C) Igneous rocks
(D) All of the above

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The outermost layer of the Earth is called ____________...?

(A) Crust
(B) Mental

(C) Core
(D) None of these

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All of the following are electromagnetic radiations except__________...?

(A) Red light
(B) Sound waves

(C) X-Rays
(D) Photon

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Spinal card controls all ___________...?

(A) Sexual activities
(B) Thinking activities

(C) Reflex activities
(D) none

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In a typical H-R diagram, stars are graphed by these two characteristics:...?

(A) Temperature and luminosity
(B) Luminosity and distance

(C) Distance and temperature
(D) Size and distance

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Which of the following is an example of a chemical reaction...?

(A) Water freezing into ice
(B) Sand settling to the bottom of a pool

(C) Leaves changing colors in the fall
(D) A rock rolling down a hill

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The most densest substance on the Earth is __________....?

(A) Platinum
(B) Copper

(C) Steel
(D) Osmium

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Gulf streams are caused by__________....?

(A) Cyclones
(B) Ocean Pressure

(C) Temperature
(D) Difference in water level

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Ultrasound has several uses in medicine and industry. Which one has use of ultrasound...?

(A) Absorption
(B) Pre-natal scanning

(C) Dispersion
(D) Measuring humidity of air

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