# RRB Previous Year Physics Questions

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