McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: General Knowledge (GK) .
| 701. |
The resistance of a conductor is inversely proportional to its - |
| A. | temperature |
| B. | resistivity |
| C. | area of cross section |
| D. | length |
| Answer» C. area of cross section | |
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Explanation: The resistance of a current carrying conductor is inversely proportional to the area of cross section of the conductor. This is because the resistance occurs due to the collision of electrons/charged particles. |
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| 702. |
is the perpendicular distance between point of application of force and axis of rotation. |
| A. | Moment arm |
| B. | Moment of Inertia |
| C. | Altitude |
| D. | Base |
| Answer» A. Moment arm | |
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Explanation: The magnitude of the moment of force acting about a point or axis is directly proportional to the distance of the force from the point or axis. |
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| 703. |
For which one of the following, "Diodes' are generally used for? |
| A. | Rectification |
| B. | Amplification |
| C. | Modulation |
| D. | Filtration |
| Answer» A. Rectification | |
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Explanation: A rectifier diode is a two-lead semiconductor that allows current to pass in only one direction. Many types of diodes are used for a wide range of applications. Rectifier diodes are a vital component in power supplies |
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| 704. |
An object is placed on the principal axis of a convex lens of focal length 10 cm. If the distance of the object from the lens is 30 cm, what is the distance of the image formed? |
| A. | 20 cm |
| B. | 15 cm |
| C. | 30 cm |
| D. | 10 cm |
| Answer» B. 15 cm | |
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Explanation: 0 |
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| 705. |
A moving neutron collides with a stationary α-particle. The fraction of the kinetic energy lost by the neutron is – |
| A. | ¼ |
| B. | 1/16 |
| C. | 9/25 |
| D. | 16/25 |
| Answer» D. 16/25 | |
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Explanation: 0 |
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| 706. |
Which of these waves can be polarized? |
| A. | Sound waves in air |
| B. | Longitudinal waves on a string |
| C. | Transverse waves on a string |
| D. | Light waves |
| Answer» D. Light waves | |
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Explanation: It is possible to transform unpolarized light into polarized light. A light. wave that is vibrating in more than one plane isreferred to as unpolarized light. Polarized light waves are light waves in which the vibrations occur in a single plane. |
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| 707. |
X-rays are – |
| A. | positively charged particles |
| B. | negatively charged particles |
| C. | neutral particles |
| D. | None of these |
| Answer» C. neutral particles | |
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Explanation: Like gamma rays and neutrons, X-rays are electrically neutral. They have neither a positive nor a negative charge. They cannot be accelerated or made to change direction by a magnet or electrical field. In contrast, charged subatomic particles comprise light charged particles (electrons and positrons) and heavy charged particles (protons, alpha particles and heavier ions). |
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| 708. |
Which of the following is the second largest source of global energy? |
| A. | Fossil fuel |
| B. | Nuclear Energy |
| C. | Renewable Energy |
| D. | None of these |
| Answer» C. Renewable Energy | |
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Explanation: Data for 2013 shows that renewable electricity generation overtook natural gas to become the second largest source of electricity worldwide producing 22% of total electricity or 5,130 Twh. |
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| 709. |
Which of the following methods will separate water from muddy water? |
| A. | Separating funnel |
| B. | Distillation |
| C. | Crystallization |
| D. | Filtration |
| Answer» D. Filtration | |
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Explanation: There are two ways to get water from a muddy mess: evaporation and filtration. Filtration is a process where the water is pumped through a porous material. |
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| 710. |
An a-particle is . |
| A. | A hydrogen molecule |
| B. | A helium nucleus |
| C. | An atom of hydrogen |
| D. | A proton |
| Answer» B. A helium nucleus | |
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Explanation: Alpha particle, positively charged particle, identical to the nucleus of the helium-4 atom, spontaneously emitted by some radioactive substances, consisting of two protons and two neutrons bound together. |
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| 711. |
What type of lens is used to correct vision of a person suffering from Myopia? |
| A. | Convex lens |
| B. | Concave lens |
| C. | Crossed lens |
| D. | Cylindrical lens |
| Answer» B. Concave lens | |
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Explanation: Near-sightedness, also known as short-sightedness and myopia, is a condition of the eye where light focuses in front of, instead of on, the retina. This causes distant objects to be blurry while close objects appear normal. |
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| 712. |
What is the name of the device used to convert alternating cur-rent into direct current? |
| A. | Amreter |
| B. | Galvanometer |
| C. | Rectifier |
| D. | Transformer |
| Answer» C. Rectifier | |
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Explanation: A rectifier is an electrical device that converts alternating current (AC), which periodically reverses direction, to direct current (DC), which flows in only one direction. The process is known as rectification. |
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| 713. |
A light year is a unit of: |
| A. | Time |
| B. | Distance |
| C. | Intencity of Light |
| D. | Frequency |
| Answer» B. Distance | |
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Explanation: A light-year is a unit of distance. It is the distance that light can travel in one year. Light moves at a velocity of about 300,000 kilometers (km) each second. So in one year, it can travel about 10 trillion km. |
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| 714. |
The SI unit of luminous emittance is - |
| A. | Lux |
| B. | Candela |
| C. | Lumen |
| D. | Lumen second |
| Answer» A. Lux | |
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Explanation: The lux is the SI unit of illuminance and luminous emittance, measuring luminous flux per unit area. It is equal to one lumen per square metre. In photometry, this is used as a measure of the intensity, as perceived by the human eye, of light that hits or passes through a surface. |
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| 715. |
Total internal reflection can not take place when light goes from – |
| A. | glass to water |
| B. | water to glass |
| C. | water to air |
| D. | glass to air |
| Answer» B. water to glass | |
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Explanation: For total internal reflection to occur the light must travel from a dense medium to a less dense medium (e.g. glass to air or water to air). It will not happen for light traveling from water (n=1.333) towards glass (n=1.52). |
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| 716. |
Hertz is a unit for measuring – |
| A. | Intensity of waves |
| B. | Frequency of waves |
| C. | Wavelength |
| D. | Clarity of waves |
| Answer» B. Frequency of waves | |
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Explanation: 0 |
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| 717. |
The unit of Planck's constant is – |
| A. | Js |
| B. | Js⁻² |
| C. | J/s |
| D. | Js² |
| Answer» A. Js | |
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Explanation: The Planck constant has dimensions of physical action; these are the same as those of angular momentum, i.e., energy multiplied by time, or momentum multiplied by distance. |
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| 718. |
If a wire of resistance R is melted and recast to half of its length, then the new resistance of the wire will be - |
| A. | R/4 |
| B. | R/2 |
| C. | R |
| D. | 2R |
| Answer» A. R/4 | |
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Explanation: 0 |
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| 719. |
Clouds float in the atmosphere because of their – |
| A. | low pressure |
| B. | low density |
| C. | low viscosity |
| D. | low temperature |
| Answer» B. low density | |
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Explanation: The key to why clouds float is that the density of the same volume of cloud material is less than the density of the same amount of dry air. Just as oil floats on water because it is less dense, clouds float on air because the moist air in clouds is less dense than dry air. |
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| 720. |
Which of the following phenomenon is responsible for the movement of water in plants? |
| A. | Pressure difference |
| B. | Concentration difference |
| C. | Transpiration |
| D. | Both (2) and (3) |
| Answer» D. Both (2) and (3) | |
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Explanation: In xylem tissues, stems and leaves are interconnected to form a continuous system of water-conducting channels reaching all parts of the plant. At the roots, cells in contact with the soil actively take up ions. |
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| 721. |
Sir C.V. Raman was awarded Nobel Prize for his work connected with which of the following phenomenon of radiation? |
| A. | Scattering |
| B. | Diffraction |
| C. | Interference |
| D. | Polarization |
| Answer» A. Scattering | |
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Explanation: Sir C.V. Raman was awarded Nobel Prize for his work scattering of radiation. Sir Chandrashekhara Venkata Raman was an Indian physicist born in the former Madras Province in India. |
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| 722. |
Removal of carbon particles from air involves the principle of - |
| A. | Precipitation |
| B. | Filteration |
| C. | Electrophoresis |
| D. | Sedimentation |
| Answer» C. Electrophoresis | |
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Explanation: Electrophoresis is the process of separating certain large molecules so they can be examined more easily. |
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| 723. |
The focal length of a plane mirror is |
| A. | Positive |
| B. | Negative |
| C. | Zero |
| D. | Infinity |
| Answer» D. Infinity | |
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Explanation: A plane mirror is a mirror with a flat reflective surface. The focal length of a plane mirror is infinity. Its optical power is zero. |
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| 724. |
The wire having a green plastic covering is a . |
| A. | Line wire |
| B. | Neutral wire |
| C. | Earth wire |
| D. | None of these |
| Answer» C. Earth wire | |
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Explanation: The earth wire is a crucial part of the home electrical system and is designed to protect against electric shock. |
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| 725. |
Who among the following invented battery? |
| A. | Rudolf Diesel |
| B. | Alfred Noble |
| C. | Alessandro Volta |
| D. | John Napier |
| Answer» C. Alessandro Volta | |
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Explanation: Alessandro Giuseppe Antonio Anastasio Volta was an Italian physicist, chemist, and a pioneer of electricity and power, who is credited as the inventor of the electric battery and the discoverer of methane. |
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| 726. |
The centre of the reflecting surface of a spherical mirror is called the : |
| A. | Radius |
| B. | Centre of Curvature |
| C. | Pole |
| D. | Focus |
| Answer» C. Pole | |
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Explanation: The center of the reflecting surface of a spherical mirron is called as the pole of the mirror which is mainly known as the center of curvature. |
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| 727. |
If a bomb dropped from an airplane explodes in mid-air . |
| A. | its KE increases |
| B. | its total energy increases |
| C. | its total energy decreases |
| D. | its total momentum decreases |
| Answer» A. its KE increases | |
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Explanation: The kinetic energy of an object is the energy that it possesses due to its motion. It is defined as the work needed to accelerate a body of a given mass from rest to its stated velocity. |
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| 728. |
The phenomenon of radioactivity was discovered by - |
| A. | Marie Curie |
| B. | Pierre Curie |
| C. | Henri Becquerel |
| D. | J.J Thomson |
| Answer» C. Henri Becquerel | |
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Explanation: In 1896 Henri Becquerel was using naturally fluorescent minerals to study the properties of x-rays, which had been discovered in 1895 by Wilhelm Roentgen. |
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| 729. |
Energy travels from Sun to Earth through – |
| A. | conduction |
| B. | convection |
| C. | radiation |
| D. | modulation |
| Answer» C. radiation | |
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Explanation: 0 |
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| 730. |
Rain drops acquire spherical shape due to - |
| A. | viscosity |
| B. | surface tension |
| C. | friction |
| D. | elasticity |
| Answer» B. surface tension | |
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Explanation: The Surface tension pulls the surface of the drop equally at all points thus produces the spherical shape having the minimum surface area. |
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| 731. |
Pieces of camphor placed on water move about rapidly. This is because of - |
| A. | diffusion |
| B. | viscosity |
| C. | surface tension |
| D. | capillarity |
| Answer» C. surface tension | |
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Explanation: The Camphor slowly dissolves in the water lowering the latter's surface tension in the immediate neighbourhood. When after sometime the whole surface settles for the reduced tension, the movement of the camphor too short. |
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| 732. |
Which among the following is a vector quantity? |
| A. | Heat |
| B. | Angular momentum |
| C. | Work |
| D. | Time |
| Answer» B. Angular momentum | |
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Explanation: Angular momentum is a vector quantity that represents the product of a body's rotational inertia and rotational velocity about a particular axis. |
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| 733. |
What does the symbol R in electricity stand for? |
| A. | Refraction |
| B. | Resonance |
| C. | Rarefaction |
| D. | Resistance |
| Answer» D. Resistance | |
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Explanation: In electricity, R stands for resistance, the property of an electric circuit or part of a circuit that transforms electric energy into heat energy in opposing electric current. |
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| 734. |
The velocity of light in vacuum is : |
| A. | 3 * 108 ms-1 |
| B. | 2 * 108 ms-1 |
| C. | 3 * 107 ms-1 |
| D. | 3 * 106 ms-1 |
| Answer» A. 3 * 108 ms-1 | |
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Explanation: The speed of light in a vacuum is 186,282 miles per second that corresponds to about 3 * 108 ms-1. |
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| 735. |
Why does a black board appears black in color? |
| A. | It reflects black color |
| B. | It absorbs black color |
| C. | It reflects all colors |
| D. | It absorbs all the colours |
| Answer» D. It absorbs all the colours | |
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Explanation: When white light falls on an opaque body, it absorbs all the colors except one color which it reflects; this reflected color is the color of the body. |
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| 736. |
The pitch of the sound is measured by its: |
| A. | Intensity |
| B. | waveform |
| C. | Frequency |
| D. | Loudness |
| Answer» C. Frequency | |
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Explanation: Pitch relates to the frequency, or how many times a second the particles vibrate. The distance between one wave and the next gives the wavelength. For sounds all travelling at the same speed, highfrequency (high-pitched) sounds have waves very close together. |
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| 737. |
Intensity of sound has - |
| A. | an object existence |
| B. | a subject existence |
| C. | no existence |
| D. | both subjective and objective existence |
| Answer» A. an object existence | |
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Explanation: Intensity of sound has an object existence. Sound intensity is defined as the sound power per unit area. |
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| 738. |
The south pole of the earth’s magnet is near the geographical . |
| A. | south |
| B. | east |
| C. | west |
| D. | north |
| Answer» D. north | |
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Explanation: The South Pole of the Earth's magnet is in the geographical North because it attracts the North Pole of the suspended magnet and vice versa. Thus, there is a magnetic S-pole near the geographical North, and a magnetic N- pole near the geographical South |
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| 739. |
Which among the following determines the pitch of a sound? |
| A. | Amplitude |
| B. | Frequency |
| C. | Loudness |
| D. | Wavelength |
| Answer» B. Frequency | |
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Explanation: The pitch of a sound is determined by the frequency of vibration of the sound waves So higher the frequency the higher is the pitch. |
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| 740. |
Ozone layer above the surface of Earth provides a shield against – |
| A. | X-rays |
| B. | Ultra-violet rays |
| C. | Gamma rays |
| D. | Infra-red rays |
| Answer» B. Ultra-violet rays | |
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Explanation: The Ozone layer absorbs 97-99% of the Sun's medium-frequency ultraviolet light (from about 200 nm to 315 nm wavelength), which potentially damages exposed life forms on Earth. |
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| 741. |
The Newton's First Law is also called as – |
| A. | Law of moments |
| B. | Law of inertia |
| C. | Law of energy |
| D. | Law of momentum |
| Answer» B. Law of inertia | |
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Explanation: According to Newton's first law, an object that is at rest will stay at rest unless an unbalanced force acts upon it and an object that is in motion will not change its velocity unless an unbalanced force acts upon it. So this law is known as the law of inertia. |
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| 742. |
Fat can be separated from milk in a cream separator because of . |
| A. | cohesive force |
| B. | gravitational force |
| C. | centripetal force |
| D. | centrifugal force |
| Answer» D. centrifugal force | |
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Explanation: The centrifugal separator was invented in 1897. By the turn of the century it had altered the dairy industry by making centralized dairy processing possible for the first time. |
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| 743. |
A charge of 2C passes from one point to the other in a circuit. If the potential difference between the two points is 5V, the amount of work done is : |
| A. | 10 J |
| B. | 0.4 J |
| C. | 2.5 J |
| D. | 5 J |
| Answer» A. 10 J | |
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Explanation: 0 |
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| 744. |
The large collection of Stars, dust and gas held together by gravitational attraction between components is known as |
| A. | Cluster |
| B. | Atmosphere |
| C. | Galaxy |
| D. | Sun Family |
| Answer» C. Galaxy | |
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Explanation: The term galaxy refers to a large collection of stars, dust, and gas clouds which are held together by gravitational attraction. |
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| 745. |
An amplifier is said to suffer from distortion when its output is - |
| A. | low |
| B. | different from input |
| C. | noisy |
| D. | larger than its input |
| Answer» C. noisy | |
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Explanation: Amplifier Distortion can take on many forms such as Amplitude, Frequency and Phase Distortion due to Clipping. For a signal amplifier to operate correctly without any distortion to the output signal, it requires some form of DC Bias on its Base or Gate terminal. |
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| 746. |
While catching a ball, a player pulls down his hands to lower the - |
| A. | force/cy |
| B. | momentum |
| C. | impulse |
| D. | catching time |
| Answer» C. impulse | |
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Explanation: 0 |
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| 747. |
Optical fibres are mainly used in- |
| A. | Communication |
| B. | Weaving |
| C. | Musical Instruments |
| D. | Food Industry |
| Answer» A. Communication | |
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Explanation: Optical Fibres used for Broadcasting. These cables are used to transmit high definition television signals which have a greater bandwidth and speed. |
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| 748. |
Radiocarbon dating technique is used to estimate the age of - |
| A. | rocks |
| B. | monuments |
| C. | soil |
| D. | fossils |
| Answer» D. fossils | |
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Explanation: Radiocarbon dating technique is used to estimate the age of fossils. It is used in dating things such as bone, cloth, wood and plant fibers that were created in the relatively recent past by human activities. |
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| 749. |
'Parsec' is the unit measurement of - |
| A. | Density of stars |
| B. | Astronomical distance |
| C. | Brightness of heavenly bodies |
| D. | Orbital velocity of giant stars |
| Answer» B. Astronomical distance | |
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Explanation: The parsec (symbol: pc) is a unit of length used to measure large distances to astronomical objects outside the Solar System. |
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| 750. |
Receptors used to detect taste are known as - |
| A. | Gustatory receptors |
| B. | Olfactory receptors |
| C. | Nerve cell receptors |
| D. | All of the above |
| Answer» A. Gustatory receptors | |
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Explanation: Gustatory receptors detect taste while olfactory receptors detect smell. Nerve cell receptors detect temperature etc. |
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