Physics Past Questions

A liquid is left in an open dish. After several days, there is less liquid in the dish. Which of the following statements explains this observation? The

An electron moves from an energy level of -8.6 eV to another level of -3.5 eV. Determine the frequency of the absorbed radiation. [1 eV = 1.6 × \(10^{19}\) J, h = 6.6 × \(10^{34}\) Js]

The range of wavelengths of the infrared waves in an electromagnetic spectrum is \(10^{-3}\) m  to \(10^{-6}\)m. The wavelength of the radiation is

The ratio of maximum range to maximum height of a projectile is 4. Determine the angle of projection.

A charge of 10 C is transferred across a potential difference of 220 V. Determine the work done.

A sound of frequency 512 Hz reaches a listener 100 m away. If the sound travels in air at s.t.p., what is its wavelength?
[speed of sound in air = 331 m/s]

The diagram above illustrates a velocity-time graph. Determine the distance between X and Y.

In an RLC series circuit at resonance, the voltages across the resistor and the inductor are 30 V and 40 V respectively. Determine the voltage across the capacitor.

The type of mirror used by dentists to inspect the teeth of patients is a

Which of the following statements about a ferromagnetic material is correct? It

The following statements are observations made about a towing vehicle and a bus that is being towed
I. The force exerted on the bus by the towing vehicle is of the same magnitude as the force that the bus exerts on the road.
II. The force exerted on the bus by the towing vehicle is of the same magnitude as the force exerted on the towing vehicle by the bus.
III. The towing vehicle exerts a force on the bus greater than the force exerted by the bus on the towing vehicle.
IV. The towing vehicle exerts a force on the bus that is the same as the force the road exerts on the towing vehicle.
Which of the following statements is/are correct?

A ball of mass 0.8 kg is dropped from a height, H. Just before hitting the ground, its velocity is 5.0 m/s. Determine H.
[g = 10 ms-2]

The instrument used to measure relative humidity is a

Which of the following devices is used to compare the relative magnitudes of charges on two given bodies?

The following statements are advantages of a solid dielectric material between the plates of a capacitor except that

A solenoid is constructed by winding an insulated copper on a long test tube. A constant direct current is passed through the solenoid. Which of the following actions will not increase the strength of the magnetic field of the solenoid? Inserting a

A 100 kg device is pulled up a plane inclined at 30° to the horizontal with a force of 1000 N. If the coefficient of friction between the device and the surface is 0.25, determine the total force opposing the motion.
[ g = 10 ms-2]

The most appropriate value of fuse for a kettle rated 220 V, 1.06 kW is

An atom in an excited state is one whose