| 1 |
In Einstein's mass-energy equation c means speed of light. Its value is: |
- A. 3 x 10<sup>-8</sup> ms<sup>-1</sup>
- B. 3 x 10<sup>8</sup>ms<sup>-1</sup>
- C. 3 x 10<sup>9</sup>ms<sup>-1</sup>
- D. 3 x 10<sup>18</sup>ms<sup>-1</sup>
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| 2 |
Einstein's mass-energy equation relation is: |
- A. E =1/2 mc<sup>2</sup>
- B. E =mc<sup>2</sup>
- C. E =m<sup>2</sup>c
- D. E = 2 mc<sup>2</sup>
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| 3 |
P.E is calculated by a formula : |
- A. Mgh
- B. mg
- C. gh
- D. Nil
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| 4 |
The speed of light is equal to: |
- A. 3 x 10<sup>5</sup> ms<sup>-1</sup>
- B. 3 x 10<sup>8</sup>ms<sup>-1</sup>
- C. 3 x 10<sup>9</sup>ms<sup>-1</sup>
- D. 3 x 10<sup>2</sup>ms<sup>-1</sup>
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| 5 |
The kinetic energy of the body of mass 1000 kg moving a speed of 20 ms<sup>-1</sup> will be: |
- A. 2 x 10<sup>2</sup> J
- B. 2 x 10<sup>3</sup>J
- C. 2 x 10<sup>5</sup>J
- D. 2 x 10<sup>8</sup>J
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| 6 |
Which one of the following converts light energy into electrical energy? |
- A. Electric bulb
- B. Electric generator
- C. Photo cell
- D. Electric cell
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| 7 |
If the force of 25 N pulls a stone through a distance of 5 cm in its direction the magnitude of work will be: |
- A. 5 J
- B. 125 J
- C. 175 J
- D. 200 J
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| 8 |
The energy stored in coal is: |
- A. Heat energy
- B. Kinetic energy
- C. Chemical enegy
- D. Nuclear energy
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| 9 |
Fossil fuels are usually: |
- A. Carbon di oxide
- B. Hydrogen
- C. Hydrocarbons
- D. Carbon monoxide
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| 10 |
Which quantity is scalar? |
- A. Force
- B. Power
- C. Velocity
- D. Torque
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