The SI standard of time is based on_____________...? Mcqs

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The SI standard of time is based on_____________...?

(A) the daily rotation of the earth
(B) the frequency of light emitted by Kr86

(C) the yearly revolution of the earth about the sun
(D) a precision pendulum clock

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

(A) Platinum
(B) Copper

(C) Steel
(D) Osmium

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Chemical Name of Dry Ice...?

(A) Solid Carbon Dioxide
(B) Calcium Carbon

(C) A&B
(D) Sodium Oxide

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The type of glass used in making lenses and prism is___________...?

(A) Pyrex glass
(B) jena glass

(C) Flintglass
(D) Soft glass

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Labrador is a breed of which animal...?

(A) Cat
(B) Dog

(C) Snake
(D) Fish

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Small portion of enzyme where substrate attach with enzyme called _____...?

(A) Binding site
(B) Active site

(C) Catalytic site
(D) Substrate site

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Which statement is incorrect about particles in liquids...?

(A) Particles are little less closely packed
(B) Particles are in loose clusters

(C) Particles are not in regular
(D) Particles have large empty spaces between them

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Asteroids are made mostly of...?

(A) Rock, metal, ice and dust
(B) Rock and metal

(C) Metal and gas
(D) Metal, gas and rock

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What is the major source of release of direct pollutants in air pollution...?

(A) Air
(B) Fuel

(C) Gas
(D) None

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What is a hypothesis...?

(A) The same thing as an unproven theory
(B) A tentative explanation that can be tested and is falsified

(C) A verifiable observation
(D) A fact based on quantitative data that is falsified

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