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Q:

Blocking in experimental design is useful because it

A) keeps the experimenter from knowing which subjects are in the treatment group. B) prevents response bias from entering into the experiment.
C) gives the quarterback enough time to throw the ball. D) controls for multiple variables in an experiment.
 
Answer & Explanation Answer: D) controls for multiple variables in an experiment.

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Q:

The phenomenon of change in direction of light when it passes from one medium to another is called

A) Propagation B) Reflection
C) Refraction D) Dispersion
 
Answer & Explanation Answer: C) Refraction

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Q:

When a bullet is fired from a gun, the gun moves in the opposite direction. This illustrates Newton's

A) third law of motion B) first and second law of motion
C) first law of motion D) second law of motion
 
Answer & Explanation Answer: A) third law of motion

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Q:

While releasing the arrow from a stretched bow, the PE of the bow is converted into?

A) chemical energy B) kinetic energy
C) sound energy D) heat energy
 
Answer & Explanation Answer: B) kinetic energy

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Q:

Diamond does not conduct electricity, because

A) It's structure is very compact B) It is of crystalline nature
C) There are only carbon atoms present in it D) No free electrons are present in it
 
Answer & Explanation Answer: D) No free electrons are present in it

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Q:

The instrument that measures the ______________ is called an anemometer.

A) wind speed B) pressure
C) humidity D) rainfall
 
Answer & Explanation Answer: A) wind speed

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Q:

If the velocity of a body becomes two times its initial velocity, its kinetic energy becomes n times its initial kinetic energy. What is the value of n?

A) 4 B) 6
C) 1/2 D) 3
 
Answer & Explanation Answer: A) 4

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Q:

What is the direction of torque?

A) Perpendicular to the direction of applied force B) Same as the direction of applied force
C) Opposite to the direction of applied force D) Parallel to the radius
 
Answer & Explanation Answer: A) Perpendicular to the direction of applied force

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