Physics Test - ...

The mirror in the below case is

The combination of 'NAND' gates shown here (in figure), is equivalent to

Two thin wire rings each having radius R are placed at a distance d apart with their axes coinciding. The charges on the two rings are \(+Q\) and - Q. The potential difference between the center of the two rings is :

A 0.5 kg block slides from A on horizontal track with an initial speed of3 m s^–1 towards a weightless horizontal spring of length 1 m1 m and force constant 2 N m^–1. The part AB of the track is frictionless and the part BC has the coefficient of static and kinetic friction as 0.22 and 0.20 respectively. If the distance AB and BD are 2 m and 2.14 m respectively, the total distance through which the block moves before it comes to rest completely is -

The voltage of clouds is 4×10⁶ V with respect to ground. In a lightning strike lasting 100 ms, a charge of 4 C is delivered to the ground. The average power of lightning strike is (assume complete discharges )

An airplane requires a speed of 108 kmph to take off, to achieve that plane runs on the runway of 100 m. Mass of the plane is 10400 kg and the coefficient of friction between the plane and the ground is 0.2. Assuming the plane accelerates uniformly, the minimum force required is (Takeg=9.81 m/s²)

A particle moves under the effect of a force F=Cx from x=0 to x=x₁. The work done in the process is (treat C as a constant):

A body freely falls from a certain height on to the ground in a time tt. During the first one-third of the time interval, it gains a kinetic energy Δk₁ and during the last one-third of the interval, it gains a kinetic energy Δk₂. The ratio Δk₁: Δk₂ is:

A body takes n times as much time to slide down an identical 45⁰ rough incline as it takes to slide down a smooth 45⁰ incline. The coefficient of friction is

A particle is projected up along a rough plane of inclination 45⁰with the horizontal. If the coefficient of friction is 0.5, the retardation is (g = acceleration due to gravity):