4
Q:

# When one enters a dark room after being in bright light one is not able to see anything clearly for a while because

 A) the retina of the eye moves forward B) the retina of the eye moves backward C) the iris is unable to dilate the pupil immediately to be able to see things D) the eye has no power of accommodation

Answer:   C) the iris is unable to dilate the pupil immediately to be able to see things

Explanation:

The size of the pupil of the automatically adjusts itself according to the intensity of light passing through it; if the intensity is more, the size is less, if less, it is more. So in our case the pupil should dilate i.e , increase in size to be able to see in the dark. This switchover takes some time. But here the entry into the dark room is immediate. So the eye has no time to adjust itself and hence is not able to see at all for a while.

Subject: Physics
Q:

What is the name of the phenomena (driven by the scattering of light) in which mountain tops acquire a rosy or orange hue around sunrise and sunset?

 A) Brillouin scattering B) Circle of confusion C) Alpenglow D) Barrel distortion

Explanation:

Filed Under: Physics
Exam Prep: AIEEE , Bank Exams

1 116
Q:

What is the name of the phenomena in physics and astronomy which involves the splitting of a spectral line into two or morecomponents of slightly different frequency when the light source is placed in a magnetic field?

 A) Lumen Effect B) Alpenglow Effect C) Zeeman Effect D) Raman Effect

Explanation:

Filed Under: Physics
Exam Prep: Bank Exams

1 86
Q:

The product of mass and velocity is called:

 A) Potential energy B) Momentum C) Force D) Kinetic energy

Explanation:

Filed Under: Physics
Exam Prep: Bank Exams

1 492
Q:

Complete the following.
1 kwh = ..........?

 A) 36 × 10-6 J B) 3.6 × 10-6 J C) 3.6 × 106 J D) 36 × 106 J

Explanation:

Filed Under: Physics
Exam Prep: Bank Exams

0 493
Q:

A body is falling from a height of 200 m. After it has fallen 100 m, the body will possess:

 A) less kinetic energy and more potential energy. B) Zero potential energy and half Kinetic energy C) more kinetic energy and less potential energy. D) half potential energy and half kinetic energy.

Answer & Explanation Answer: D) half potential energy and half kinetic energy.

Explanation:

Filed Under: Physics
Exam Prep: Bank Exams

0 87
Q:

What is the upward force exerted by the water on the bottle containing it called?

 A) Tension B) Buoyant Force C) Thrust D) Pressure

Explanation:

Filed Under: Physics
Exam Prep: Bank Exams

0 228
Q:

Energy possessed by an object of mass 10 kg when it is at a height of 8 m above the ground. Given g=9.8 $ms-2$

 A) 784 J B) 588 J C) 520 J D) 528 J

Explanation:

Filed Under: Physics
Exam Prep: Bank Exams

0 142
Q:

How much work is done in moving a charge of 4 C across two points having a potential difference of 12 V?

 A) 48 J B) 3 J C) 40 J D) 12 J