Questions (120)
Q1CDS2014
The upper and lower portions in common type of bi-focal lenses are respectively
- A concave and convex ✓
- B convex and concave
- C both concave of different focal lengths
- D both convex of different focal lengths
✓ Correct answer: (A)
Science & Technology › Physics & Chemistry
Q2CDS2014
Tungsten is used for the construction of filament in electric bulb because of its
- A high specific resistance
- B low specific resistance
- C high light emitting power
- D high melting point ✓
✓ Correct answer: (D)
Science & Technology › Physics & Chemistry
Q3CDS2014
Inactive Nitrogen and Argon gases are usually used in electric bulbs in order to
- A increase the intensity of light emitted
- B increase the life of the filament ✓
- C make the emitted light coloured
- D make the production of bulb economical
✓ Correct answer: (B)
Science & Technology › Physics & Chemistry
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