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Q:

A mass of 20 kg is at a height of 8 m above the ground. Then the potential energy possessed by the bodyis: [Given g = 9.8 m/s]

A) 1568 J B) 1568 C
C) 1568 W D) 1568 N
 
Answer & Explanation Answer: A) 1568 J

Explanation:
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Q:

Which color has the highest energy?

A) Violet B) Red
C) Blue D) White
 
Answer & Explanation Answer: A) Violet

Explanation:

Violet colour has the highest energy. The higher the frequency, the faster the oscillations and thus the higher the energy. Therefore, the highest-frequency ultra-violet light or the lowest wavelength is violet.

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Q:

In a projectile motion, a large angle with the horizontal produces ______.

A) flat trajectory B) curve trajectory
C) straight trajectory D) high trajectory
 
Answer & Explanation Answer: D) high trajectory

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Q:

Electric charges that are different attract each other.

A) TRUE B) FALSE
Answer & Explanation Answer: A) TRUE

Explanation:

Same charges will repel each other and the charges that are different will attract each other.


Electric_charges_that_are_different_attract_each_other._1545283189.png image

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Q:

Glass is made from the mixture of

A) Sand and silicates B) Salt and Sand
C) Salt and silicates D) None of the above
 
Answer & Explanation Answer: A) Sand and silicates

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Q:

When a constant force acts on an object with a mass of 8 kg for a duration of 3 s. it increases the object's velocity from 4 m/s to 6 m/s . What is the magnitude of the applied force?

A) 5.33 N B) 4.33 N
C) 6.33 N D) 3.33 N
 
Answer & Explanation Answer: A) 5.33 N

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Q:

Speed regulation of synchronous motor is

A) 1% B) 25%
C) Zero D) 0.5%
 
Answer & Explanation Answer: C) Zero

Explanation:

speed_regulation_of_synchronous_motor1553077296.jpg image

Synchronous motor is a motor which runs at a constant speed irrespective of load attached to it. So the speed regulation of synchronous motor is ZERO.

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Q:

Magnetism in materials is due to

A) Displacement of electrons B) Circular motion of electrons
C) Charges of neutrons D) All of the above
 
Answer & Explanation Answer: B) Circular motion of electrons

Explanation:

Magnetism in materials is due to circular motion of electrons.

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