| 1 |
Thermoflask is used maintain: |
- A. Heat
- B. Temperature
- C. Density
- D. Pressure
|
| 2 |
____________ from sun are major source of energy on earth. |
- A. Light
- B. Radiation
- C. Both a & b
- D. None of these
|
| 3 |
On heating Air becomes. |
- A. Heavier
- B. Lighter
- C. Remain same
- D. None
|
| 4 |
____________ is bad conductors of heat: |
- A. Copper
- B. Water
- C. Wire
- D. Nil
|
| 5 |
Metals are good conductor of heat due to: |
- A. Free electrons
- B. Reamain same
- C. Small size of their molecules
- D. Rapid vibration of their atoms
|
| 6 |
Metals are good conductor of heat dut to the: |
- A. Free electron
- B. Big size of their molecule
- C. Small size of their molecules
- D. Rapid vibrations of their atoms
|
| 7 |
The substances through which heat does not conduct: |
- A. Conductors
- B. Bad conductors
- C. Insulators
- D. Both B and C
|
| 8 |
Feathers of bird give good thermal: |
- A. Conduction
- B. Insulation
- C. Convection
- D. None of these
|
| 9 |
Land and Sea breezes are the results of: |
- A. Conduction
- B. Convection
- C. Radiation
- D. Conduction and Radiation
|
| 10 |
Leslie cube have faces: |
|