Science (Practice Test-2)

1. An object kept in between two plane mirrors inclined at an angle 60°. Find the number of images formed.

  • 4
  • 3
  • 7
  • 5
Answer
3

2. Focal length of a convey lens is 50 cm. Find its power-

  • +1/50 D
  • +2 D
  • -1/50 D
  • -2 D
Answer
+2 D

3. Find the value of equivalent resistance between A and B.

  • r
  • 2r
  • 3r
  • 3/2r
Answer
r

4. A object kept infront of a concave mirror at 30 cm from the mirror forms its image at 40 cm behind the mirror. Focal length of mirror is-

  • 120 cm
  • 70 cm
  • 10 cm
  • 17.1 cm
Answer
17.1 cm

5. A 100m long telephone wire carries 0.1 A current when a battery of 12 v is connected across its ends. Find its resistance per meter.

  • 120 Ω
  • 12 Ω
  • 0.12 Ω
  • 1.2 Ω
Answer
1.2 Ω

6. An electric bulb is rated at 220 v – 100 W. Find the resistance of its filament.

  • 220 Ω
  • 100 Ω
  • 200 Ω
  • 150 Ω
Answer
100 Ω

7. The mass of a man on earth is 70 Kg. What is his mass on the moon?

  • 35 kg
  • 70 kg
  • 116.6 kg
  • 11.66 kg
Answer
11.66 kg

8. Which of the following is natural plastic?

  • Teflon
  • PVC
  • Lac
  • Bakelite
Answer
Lac

9. Purification of copper is done by-

  • Electrorefining
  • Zone-refining
  • Vaur-orchel
  • None
Answer
Electrorefining

10. Which of the following is a liquified mixture of normal Butane and ISO Butane?

  • Coal Gas
  • Petrol Gas
  • Liquified petroleum gas
  • Water Gas
Answer
Liquified petroleum gas