Physics

A tuning fork is vibrating at 250 Hz. The length of the shortest closest organ pipe that will resonate with the tuning fork will be_____cm.

(Take speed of sound in air as 340 ms^-1)

A capacitor of 50   $\mu F$  is connected in a circuit as shown in figure. The charge on the upper plate of the capacitor is__________   $\mu C.$

A plane electromagnetic wave with frequency of 30 MHz travels in free space. At particular point in space and time, electric field is 6 V/m. The magnetic field at this pint will be x * 10^-8T. The value of x is_______.

A car is moving on a plane inclined at 30° to the horizontal with an acceleration of 10ms^-2 parallel to the upward. A bob is suspended by a string from the roof of the car. The angle in degree which the string makes with the vertical is______. (Take g = 10ms^-2)

A square shaped wire with resistance of each side   $3\Omega$  is bent to form a complete circle. The resistance between two diametrically opposite points of the circle in unit of   $\Omega$  will be________.

A heat engine operates between a cold reservoir at temperature T₂ = 400K and a hot reservoir at temperature T₁. It takes 300J of heat from the hot reservoir and delivers 240J of heat to the cold reservoir in a cycle. The minimum temperature of the hot reservoir has to be________K.

The voltage drop across $15\Omega$ resistance in the given figure will be_______V.

The ratio of the equivalent resistance of the network (shown in figure) between the points a and b when switch is open and switch is closed in x : 8. The value of x is_________.

The voltage drop across   $15\Omega$  resistance in the given figure will be_______V.

Water drops are falling from a nozzle of a shower onto the floor, from a height of 9.8m. The drops fall at a regular interval of time. When the first drop strikes the floor, at that instant, the third drop begins to fall. Locate the position of second drop from the floor when the first drop strikes the floor.