quiz by nisha

What is the rate of flow of electric charges called?

• Electric potential

•  electric conductance

• Electric current

  
  

• none of these

Bird is flying in north-east direction with or v = 4√2 m/s with respect to the wind and the wind blowing from north to south with speed 1 m/s. Find the magnitude of the displacement of the bird in 3 sec.

• 5m

• 10m

• 15m

• none of these

A projectile is thrown from a point O on the ground at an angle 45° from the vertical and with a speed of 5 √2 m/s . The projectile at the highest point of its trajectory splits into two equal parts. One part falls vertically down to the ground, 0.5 s after the splitting. The other part, t seconds after the splitting, falls to the ground at a distance x meters from the point O. The acceleration due to gravity g = 10 m/s² . The value of t is ________.

• 0.5

• 1

• 0.05

• 0.1

Airplanes A and B are flying with constant velocity in the same vertical plane at angles 30⁰ and 60⁰ with respect to the horizontal respectively as shown in the figure. The speed of A is 100√3 m/s. At time t = 0 s, an observer in A finds B at a distance of 500 m. This observer sees B moving with a constant velocity perpendicular to the line of motion of A. If at t = t₀, A just escapes being hit by B, t₀ in seconds is

• 5s

• 0.5s

• 10s

• 15s

A bus is moving with a constant velocity v₁ along a horizontal road. A man standing inside the bus throws a ball upward with velocity v₀ and catches the ball. The magnitude of displacement of the ball with respect to the ground is

• v₀²/g

• Zero

• 2v₀v₁/g

• none of these