RRB Previous Year Physics Questions


What is the momentum of a man of mass 75 kg when he walks with a uniform velocity of 2 m/s?

  • 50 kg m/s
  • 75 kg m/s
  • 100 kg m/s
  • 150 kg/s

At the center of the earth, the value of g becomes-

  • Infinity
  • Unity
  • Zero
  • None of these

Two unequal masses possess the same momentum, then the kinetic energy of the heavier mass is ………………..the kinetic energy of the lighter mass.

  • smaller than
  • greater than
  • same as
  • none of these

15 Bulbs of 60 W each, run for 6 hours daily and a fridge of 300 W runs for 5 hours daily. Find the forthright bill at the rate of 30 paise per unit?

  • Rs. 31.05
  • Rs. 45.55
  • Rs. 62.10
  • Rs. 75.10

Sheaths are used in cables to-

  • Provide proper insulation
  • Provide mechanical strength
  • Prevent ingress of moisture
  • None of these

For the stable operation of the interconnected system, the passive element that can be used as the interconnecting element is-

  • Reactor
  • Resistor
  • Capacitor
  • Resistor and Capacitor

The insulation resistance of a cable of length 10 km is 1 MΩ, its resistance for 50 km length will be-

  • 1 MΩ
  • 5 MΩ
  • 0.2 MΩ
  • 10 MΩ

The rate of change of momentum is directly proportional to-

  • Force
  • Inertia
  • Moment
  • None of these

If four 80 μF capacitors are connected in parallel, the net capacitance is-

  • 20 μF
  • 80 μF
  • 160 μF
  • 320 μF

The transformer used to decrease the magnitude of the alternating voltage is a-

  • step-up transformer
  • step-down transformer
  • step-in transformer
  • step-out transformer

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