RRB GROUP D Physics Quiz - 70

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Question 1:

Two persons are holding a rope of negligible mass horizontally. A 20 kg mass is attached to the rope at the midpoint; as a result, the rope deviates from the horizontal direction. The tension required to completely straighten the rope is (g=10 m/s^2)

Question 2:

A boy of mass 40 kg running at 4 m/s jumps on to a 20 kg trolley travelling in the same direction at 1 m/s. What is their common velocity ?

Question 3:

Which of the following statement is incorrect?

Question 4:

A projectile is thrown from a point in a horizontal place such that its horizontal and vertical velocity component are 9.8 m/s and 19.6 m/s respectively. Calculate its horizontal range -

Question 5:

An intrinsic semiconductor at absolute zero temperature is a -

Question 6:

A car of mass 600 kg moving at 2 m/s collides with a truck of mass 1400 kg moving in the same direction at 2 m/s. What is their common velocity just after the collision if they move off together?

Question 7:

What is the change in momentum of a car of mass 800 kg when its speed increases from 72 km/h to 90 km/h uniformly ?

Question 8:

A cricket ball of mass 150 g is moving with a velocity of 12 m/s and is hit by a bat so that the ball is turned back with a velocity of 20 m/s. The force of bat acts for 0.01 s on the ball. The average force exerted by the bat on the ball is-

Question 9:

A resistor of 8 ohms is connected in parallel with another resistor X. The resultant resistance of the combination is 4.8 ohms. What is the value of the resistor X ?

Question 10:

An electric current of 0.75 A flows through a filament of an electric bulb for 5 minutes. Find the amount of electric charge flowing through the electric current.