Physics Questions

Q:

A wooden block of mass m1 kg accelerates at m/s when a force of 5 N acts on it. Another block of mass m2 kg accelerates at 20 m/s when the same force acts on it. If both the blocks are tied together and the same force acts on their combination, the acceleration will be about

 

A) 6.67 m/s2 B) 1.67 m/s2
C) 5.67 m/s2 D) 4.67 m/s2
 
Answer & Explanation Answer: A) 6.67 m/s2

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Q:

Which rays cause skin damage?

A) X­-Rays B) UV Rays
C) Infra red rays D) Yellow Rays
 
Answer & Explanation Answer: B) UV Rays

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Q:

When a number of resistors are connected in series in a circuit, the value of current:

A) increases B) becomes half
C) decreases D) remains the same
 
Answer & Explanation Answer: D) remains the same

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Q:

A Sonar of a ship sends sounds waves of speed 1600 m/s. These waves are reflected back by the ocean floor in 4 seconds. Find the depth (in m) of the ocean floor.

 

A) 6400 B) 3200
C) 1600 D) 4800
 
Answer & Explanation Answer: B) 3200

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Q:

Find the position of the image formed by a concave mirror when the object is placed between P and F?

A) At infinity B) Between F and C
C) Behind the mirror D) Beyond C
 
Answer & Explanation Answer: C) Behind the mirror

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Q:

A galvanometer can be converted to a voltmeter by connecting

A) a high resistance in parallel B) a high resistance in series
C) a low resistance in series D) a low resistance in parallel
 
Answer & Explanation Answer: B) a high resistance in series

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Q:

Which among the following determines the pitch of a sound?

A) Amplitude B) Frequency
C) Loudness D) Wavelength
 
Answer & Explanation Answer: B) Frequency

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Q:

The material used in electric heater is

A) Tungsten B) Nichrome
C) Brass D) Steel
 
Answer & Explanation Answer: B) Nichrome

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