Physics

1Work and energy have the same unit.

2Hot air rises because it is less dense than cold air.

3Two forces of 6 N and 8 N act in opposite directions. Their resultant is

4Capacitors of 6 μF and 12 μF are connected in series. Find the total capacitance.

5The rule used to find the direction of the magnetic field around a wire is the right-hand ___ rule.

6The SI unit of resistance is the

7Efficiency of a machine is

8Sound cannot travel through

9Blue light photons carry more energy than red light photons.

10A transformer has 1,000 primary turns and 10,000 secondary turns. If the primary voltage is 240 V, find the secondary voltage.

11A body starts from rest and accelerates at 2 m/s² for 5 s. The distance covered is

12When an object is placed between F and a converging lens, the image is

13A machine lifts 200 N with an effort of 100 N. Its mechanical advantage is ___.

14A thermometer that uses the voltage produced at the junction of two different metals is a

15A horizontal line on a velocity–time graph means the body is at rest.

16A wave has a period of 0.02 s. What is its frequency?

17The frequency heard from an approaching ambulance siren is higher because of the

18A wire of length 0.1 m carrying 2 A lies at 60° to a magnetic field of 0.2 T. Find the force on it.

19A logic gate whose output is 0 only when both inputs are 0 is the ___ gate.

20A cell of e.m.f. 12 V and internal resistance 0.5 Ω is connected to a 10 Ω resistor. Find the current.