NDA 2017 Paper 2 | Physics Question 84 | General Science

NDA 2017 Paper 2

MCQ (Single Correct Answer)

+2.5

-0.83

Which one of the following statements is not correct?

Ultrasonic waves cannot get reflected, refracted or absorbed.

Ultrasonic waves are used to detect the presence of defects like cracks, porsity, etc. in the internal structure of common structure materials.

ultrasonic waves can be used for making holes in very hard materials like diamond.

Ultrasonic waves cannot travel through vacuum.

NDA 2017 Paper 2

MCQ (Single Correct Answer)

+2.5

-0.83

An object moves in a circular path with a constant speed. Which one of the following statements is correct?

The centripetal acceleration of the object is smaller for a gentle curve (i.e. curve of larger radius) than that for a sharp curve (i.e. curve of smaller radius).

The centripetal acceleration is greater for a gentle curve than that for a sharp curve.

The centripetal acceleration is the same for both the gentle and sharp curves.

The centripetal acceleration causes the object to slow down.

NDA 2017 Paper 2

MCQ (Single Correct Answer)

+2.5

-0.83

The force acting on a particle of mass m moving along the X-axis is given by F(x) = Ax² $$-$$ Bx. Which one of the following is the potential energy of the particle?

2Ax $$-$$ B

$$ - {{{x^2}} \over 6}(2Ax - 3B)$$

Ax³ $$-$$ Bx²

Zero

NDA 2017 Paper 2

MCQ (Single Correct Answer)

+2.5

-0.83

The symbol of SI unit of inductance is H. It stands for

Holm

Halogen

Henry