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Q:

The SI unit of acceleration is _______________.

A) meters per seconds squared B) meters per second
C) seconds per meter D) seconds per meter squared
 
Answer & Explanation Answer: A) meters per seconds squared

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Q:

In a qualitative way, the tendency of undisturbed objects to stay at rest or to keep moving with the same velocity is called _________.

A) force B) acceleration
C) friction D) inertia
 
Answer & Explanation Answer: D) inertia

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Q:

Convex and concave mirrors are examples of?

A) Plane mirrors B) Spherical mirrors
C) Inverted mirror D) Erect mirror
 
Answer & Explanation Answer: B) Spherical mirrors

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Q:

Ozone protects biosphere from ___________

A) X ­- rays B) Gamma rays
C) Ultraviolet rays D) Infrared rays
 
Answer & Explanation Answer: C) Ultraviolet rays

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Q:

What is the noise level of normal conversation?

A) About 60 dB B) About 70 dB
C) About 80 dB D) About 90 dB
 
Answer & Explanation Answer: A) About 60 dB

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Q:

In hydel power station, the motion produced in turbines is due to

A) flow of water B) burning of coal
C) burning of diesel D) production of steam
 
Answer & Explanation Answer: A) flow of water

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Q:

Bubbles of air rise up through liquids due to

A) Surface tension and adherence B)  viscosity and buoyancy
C)  air current over the liquid and buoyancy D)  Up thrust and surface tension
 
Answer & Explanation Answer: B)  viscosity and buoyancy

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Q:

What does the slope of a velocity time graph represent?

A) Acceleration B) Distance
C) Speed D) Momentum
 
Answer & Explanation Answer: A) Acceleration

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