General Physics Multiple Choice Quiz | 10 Questions

Answer: Nut cracker

In second class levers, the load is situated in the middle while the fulcrum and effort are at the ends. Ice tongs and shovels are examples of third class levers, in which effort lies in between fulcrum and load. Scissors are an example of a first class lever, in which the fulcrum is in the middle with load and effort at the ends.

Answer: Watt

The rate of doing work is called power, and the SI unit of power is the watt. The energy is defined as the capacity of doing a work. The joule and kilowatt hour are units of energy. Th kelvin is the SI unit of temperature.

Answer: William Herschel

William Herschel is credited with the discovery of infrared radiation in 1800. Infrared radiation has a longer wavelength than visible light. This radiation is emitted by every hot body. The wavelength generally lies between 700 nanometer to 1 millimeter. This radiation is used in thermal imaging cameras and in smoke detectors.

Answer: Platinum

A paramagnetic material is a material which is weakly magnetized when kept in a magnetic field, but does not retain and magnetism. Gold, silver and copper are diamagnetic in nature, which means they are repelled by a magnetic field. Paramagnetic materials have unpaired electrons while in diamagnetic elements all the electrons are paired.

Answer: Heinrich Rudolf Hertz

The photoelectric effect is a phenomenon in which light is converted to electrical energy. Hertz observed that, when a light of certain frequency falls on a metal plate with low ionization energy, electrons are emitted from the plate, leading to the photoelectric effect.

Later Einstein explained this phenomenon by saying that light consists of small packets of energy called photons. When a photon strikes an electron, it transfers its energy to the electron.

Answer: Interference

The rainbow colours of CDs are due to the constructive and destructive interference of light. Interference of light is a phenomenon in which two or more light waves superimpose at a point where they either construct a new wave (constructive interference) or destroy each other (destructive interference).

When white light strikes the film, most of it passes through it, but some is reflected off the top and bottom layers of the film. If the distance between the film is in the wavelength of visible light, the reflected light produces the rainbow effect.

Answer: Steep

A tunnel diode is a type of diode which, at first, behaves like a normal diode, but when voltage is increased it provides negative resistance - i.e as voltage is increased current decreases. It is a very fast operating diode. A Gunn diode is composed of only one type of semiconductor, usually N type. It utilizes negative resistance characteristics to generate current at high frequency. A Zener diode is a special purpose diode which works in reverse bias. It is used in a region of reverse voltage breakdown and keeps the current flow constant even when voltage is increased drastically.

The Steep diode doesn't exist.

Answer: Proton

The nucleus of an atom has protons and neutrons in it. Electrons revolve around the nucleus in an discrete orbit. Protons are the positively charged particles while electrons are negatively charged particles. Photons are the elementary particle of light. The positron is the anti particle of the electron.

Answer: Siriometer

This unit is very rarely used in practical terms, but is equal to one million astronomical units. One astronomical unit is the distance between the sun and the earth. In light years, one siriometer is equal to 15.83 light years.

Answer: Distance travelled by the object

The velocity of an object is the change in displacement with respect to time. As displacement is zero so the average velocity is zero. Acceleration of an object is its change in velocity with respect to time, so average acceleration is zero. Work done is the product of displacement and force.

As displacement is zero so work done is zero. Distance can be non-zero even if displacement is zero.