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Free gk questions Online Test - MeritNotes

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No. of Questions :10

Remaining Time :

1. The refractive index of Benzene is

(a)
1.50
(b)
1.53
(c)
1.54
(d)
1.55

2. Optical fibre is used in

(a)
Thermometer
(b)
Bioscope
(c)
Stethoscope
(d)
Endoscope

3. For total internal reflection the angle of incidence is

(a)
Equal to 90 degree
(b)
Equal to the critical angle
(c)
Less than the critical angle
(d)
Greater than the critical angle

4. The refractive index of glass depends on

(a)
The intensity of the incident light
(b)
The size of the glass slab
(c)
The colour of the incident light
(d)
The angle of incidence

5. In the human being, the part which is sensitive to light is

(a)
Ciliary muscles
(b)
Retina
(c)
The eye ball
(d)
Sclera

6. The angle of incidence for which the angle of refraction is 90° is called as

(a)
Critical angle
(b)
Obtuse angle
(c)
Straight angle
(d)
Right angle

7. A fixed point lying in between the two spherical surfaces through which a ray of light passing suffers no deviation is

(a)
Focal length
(b)
Principal axis
(c)
Optic centre
(d)
Principal focus

8. The final image in a compound microscope is

(a)
Real and erect
(b)
Virtual and erect
(c)
Virtual and inverted
(d)
Real and inverted

9. If an object absorbs all colours, it appears

(a)
Red
(b)
Black
(c)
Blue
(d)
Violet

10. The critical angle of glass is

(a)
24°
(b)
42°
(c)
45°
(d)
90°

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