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1.
A lens with power + I dioptre must have its focal length equal to
- A.100 cm
- C.1 cm
- B.10cm
- D.1000cm
- Answer
- Report
Answer : [A]
2.
What is the increasing order of the wavelengths of the following colours?
- Orange
- Indigo
- Yellow
- Violet
- A.1,2,3,4
- C.1,3,2,4
- B.3,1,4,2
- D.4,2,3,1
- Answer
- Report
Answer : [D]
3.
A wooden block is floating in water. If 4/5 of its volume is immersed in water and volume of the water displaced is 800 ml, the volume of the block is
- A.1140 ml
- C.800 ml
- B.200ml
- D.1000ml
- Answer
- Report
Answer : [D]
4.
Which one of the following will take place when a watch based on oscillating spring is taken to a deep mine?
- A.It will become slow
- B.It will become fast
- C.it will indicate the same time as on earth
- D.It will stop working
- Answer
- Report
Answer : [C]
5.
The colour of an opaque object is due to the colour it
- A.absorbs
- C.reflects
- B.refracts
- D.scatters
- Answer
- Report
Answer : [C]
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