An iron spherical ball having an external volume of 10 cm³ is dipped in a beaker containing water of specific gravity 1 gm/cm³. The weight of the ball would be reduced by-
- Collecting more data for making the calculation
- 0.1 gm
- 1 gm
- 10 gm
Archimedes Principle is related to-
- Laws of flotation
- Right-angled triangle
- Laws of gravity
- The relation between current and voltage
A wire of a certain length has a resistance of 2.2 Ω. If the wire is stretched to twice its original length, then find the new resistance?
- 8.8 Ω
- 1.1 Ω
- 2.2 Ω
- 4.4 Ω
The safe temperature to keep eatables fresh in a refrigerator is-
- 4 °C
- 0 °C
- 18 °C
- 10 °C
Dynamo converts-
- Electrical energy into mechanical energy
- High voltage into low voltage
- Low voltage into high voltage
- Mechanical energy into electrical energy
The instrument used to measure the electric current is
- Barometer
- Altimeter
- Ammeter
- Anemometer
The best conductor of electricity is-
- Aluminum
- Copper
- Iron
- Silver
A body strikes the floor vertically with a velocity u and rebounds at the same speed. The change of speed would be-
- 3 u
- zero
- 1 u
- 2 u
Which of the following is different from others?
- Speed
- Time
- Density
- Force
Momentum has the same unit as that of-
- Torque
- Couple
- Impulse
- Moment of Momentum