The distance between the optical centre of a convex lens and its principal focus is called its_______...? Mcqs

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The distance between the optical centre of a convex lens and its principal focus is called its_______...?

(A) Focal Length
(B) Radius of Curvature

(C) Power
(D) Magnification

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What measurement scale is used to determine wind speed...?

(A) Richter Scale
(B) Beaufort Scale

(C) Meter-second scale
(D) None of these

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The cold war between the organisms of a community occupying the same habitat is called _____...?

(A) Predation
(B) Competition

(C) Mutualism
(D) Commensalism

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Which of the following is used for hearing the sound of heart and lungs...?

(A) Steroscope
(B) Stethoscope

(C) Oscillator
(D) Oncolator

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A wheel with pointed edges like teeth are...?

(A) Pulley
(B) Gear

(C) Axle
(D) Sprocket

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The temperature at which water boils depends mainly on ____________...?

(A) Air temperature
(B) Relative humidity

(C) Air pressure
(D) Air density

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Air contains maximum amount of__________...?

(A) oxygen
(B) nitrogen

(C) hydrogen
(D) carbon dioxide

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Which of the following occurs when light passes through a substance unchanged...?

(A) Transmission
(B) Reflection

(C) Absorption
(D) Refraction

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The audible range of normal elephant ear is ______...?

(A) 16 Hz to 20kHz
(B) 10 Hz to 31kHz

(C) 67 Hz to 45kHz
(D) 20 Hz to 20kHz

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Insects responsible for transmitting diseases are called___________...?

(A) Drones
(B) Vectors

(C) Hybirds
(D) None of these

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