PHYSICS OBJECTIVE Q&A FOR UPSC(NDA/NA),Exam
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UPSC NDA/NA PHYSICS MCQ Q.1.
Pressure of a gas increases due to increase of its temperature because at higher temperature-
(a) gas molecules repel each other more.
(b) potential energy of the gas molecules is higher.
(c) kinetic energies of the gas molecules are higher.
(d) gas molecules attract each other more.
Ans. (c)
UPSC NDA/NA PHYSICS MCQ Q.2.
A motor vehicle is moving on a circle with a uniform speed. The net acceleration of the vehicle is -
(a) zero.
(b) towards the centre of the circle.
(c) away from the centre along the radious of the circle.
(d) perpendicular to the radius and along the velocity.
Ans.(b)
UPSC NDA/NA PHYSICS MCQ Q.3.
An object is undergoing a non-accelerated motion. Its rate of change in momentum is -
(a) a non-zero constant.
(b) zero.
(c) not a constant.
(d) none of these.
Ans. (b)
We know that,
Momentum, p = mv
Or, (dp/dt) = m(dv/dt)
( given that dv/dt =0)
So (dp/dt) = 0
UPSC NDA/NA PHYSICS MCQ Q.4.
Imagine a current carrying wire with the direction of current downward or into the page. The direction of magnetic field lines is -
(a) clockwise.
(b) anti-clockwise.
(c) into the page.
(d) out of the page.
Ans. (a)
UPSC NDA/NA PHYSICS MCQ Q.5.
The human eye is like a camera and hence, it contains a system of lens. The eye lens forms -
(a) a straight or upright, real image of the object on the retina.
(b) an inverted, virtual image of the object on the retina.
(c) an inverted, real image of the object on the retina.
(d) a straight or upright, real image of the object on the iris.
Ans. (c)
UPSC NDA/NA PHYSICS MCQ Q.6.
A car is moving with a uniform speed. However, its momentum is changing. Then the car -
(a) may be on an elliptical path.
(b) is moving on a straight path without acceleration.
(c) is moving on a straight path with acceleration.
(d) is moving without any acceleration.
Ans.(a)
UPSC NDA/NA PHYSICS MCQ Q.7.
Ohm's law defines -
(a) a resistance.
(b) current only.
(c) voltage only.
(d) both current and voltage.
Ans.(a)
UPSC NDA/NA PHYSICS MCQ Q.8.
An ant is moving on thin (negligible thickness) circular wire. How many coordinates do you reqire to completely describe the motion of the ant?
(a) one.
(b) two.
(c) three.
(d) zero.
Ans.(b).
UPSC NDA/NA PHYSICS MCQ Q.9.
A current carrying wire is known to produce magnetic lines of force around the conducting straight wire. The direction of the lines of force may be described by -
(a) left hand thumb rule for up currrnt and right hand thumb rule for down current.
(b) right hand thumb rule for up current and left hand thumb rule for down current.
(c) right hand thumb rule for both up and down current.
(d) left hand thumb rule for both up and down current.
Ans. (c)
UPSC NDA/NA PHYSICS MCQ Q.10.
If an object undergoes a uniform circular motion, then its-
(a) acceleration remains uniform.
(b) velocity changes.
(c) speed changes.
(d) velocity remains uniform.
Ans. (b)
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