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English Portal MCQs [121]

You will find all MCQs which are added in English Portal by Physics Walla

Q. The humidity of the air depends upon
Q. A circular plate, a cube and a sphere, all made up of same material and having the same mass, are heated to 300°C and left in a room. Which of them will have the slowest rate of cooling?
Q. Liquids and gases never show
Q. Supercooling is cooling of liquid ______
Q. At constant pressure, the volume of a fixed mass of a gas is directly proportional to its absolute temperature. It is the statement of
Q. A metal plate with a circular hole at the centre is heated. What will happen to the area of the hole ?
Q. The ''four stroke petrol engine' is based on
Q. Which of the following device is best suited for measuring the temperature inside metallurgical furnaces?
Q. The value of coefficient of restitution in perfectly elastic collision is
Q. If there is a circular hole in a metal plate, what happens to the radius of the hole when the plate is heated?
Q. The instrument that measures and records the relative humidity of air is
Q. Which set of conditions represents the easiest way to liquify a gas ?
Q. Which of the following device is used to measure humidity?
Q. Thermohaline circulation is mainly due to
Q. The ''Greenhouse effect' is mainly due to increase in atmospheric
Q. Charles's law is based on
Q. Boyle's law relates to
Q. For the measurement of temperature of the order of 400° C, we will prefer
Q. The range of platinum resistance thermometer is
Q. When an object is heated, the molecules of that object
Q. In which mode of transmission, the heat waves travel along straight line with the speed of light?
Q. When temperature is gradually decreased the specific heat of substance is
Q. A circular disc of copper has a symmetrical hole at its centre. The disc is uniformly heated. The diameter of the hole will
Q. If the temperature scale is changed from °C to °F the numerical value of specific heat will
Q. The correct value of 0°C on the kelvin scale is
Q. A temperature at which both the fahrenheit and the centigrade scales have the same value is
Q. Which of the following substances has greatest specific heat?
Q. The amount of heat required to raise the tempreature of a body through 1 k is called, its
Q. The unit of the coefficient of linear expansion is
Q. At 0K the velocity of the molecules is
Q. One calorie is the heat required to raise the temperature of 1g of water by
Q. On thermometer, the freezing point of water is marked as 20° and the boiling of water is marked as 150° A temperature of 60° C will be read on this thermometer as
Q. A photo electric cell converts
Q. A dynamo converts
Q. An electrical motor converts
Q. Which of the following sounds can be heard by human ear?
Q. When cream is separated from milk, density of milk
Q. Which one of the following is a fusion process?
Q. Which one of the following is determined by wet-bulb and dry-bulb thermometer?
Q. Which one of the following is abundantly present in the atmosphere?
Q. The filament of an electric bulb is made up of
Q. The role of alum in water purification is
Q. Clear night is cooler than cloudy night because
Q. Why a weather balloon is not fully inflated on the ground?
Q. Which one of the following is the most accurate method for determining the age of crust of the earth?
Q. Buoyancy is related to
Q. Electron was discovered by
Q. The gas produced during lightning is
Q. For the rear view, motorists use
Q. The dentist's mirror is a
Q. Which one of the following can be used as burning glass?
Q. Which one of the following mirrors is suitable to obtain real image of an object?
Q. If one approaches a plane mirror at the speed of 15cm/s than his image will be approaching him at speed of
Q. The minimum length of a plane mirror where one can see his full image is
Q. The image of an object formed by plane mirror
Q. During the total solar eclipse which part is visible?
Q. A small hole in the window forms an inverted image on the opposite wall due to
Q. Planet is a
Q. The ratio of the total distance travelled by a body to the total time taken by it is its
Q. An object travels 15 m in 4 s and then another 16 m in 3 s. What is the average speed of the object?
Q. Which results in an increase in power?
Q. Which of the following definitions describes a physical hazard?
Q. Cryogenic Engines find applications in
Q. Which of the following is measured in the unit called Gauss?
Q. Which of the following works as the basis of conservation of liner
Q. Which of the following objects would possess potential energy?
Q. A car parked in the sun with its windows closed gets terribly hot inside. This is due to
Q. Water kept in an earthen pot is less cool on rainy days than in summer because during the rainy days
Q. When white light passes through a glass prism we get a spectrum on the other side of the prism. In the emergent beam the ray which is deviated least is
Q. Generally radar is used for
Q. Television signal is limited to a particular distance because
Q. Quality of radio reception increases slightly during night because
Q. Which layer of the atmosphere is responsible for reflecting radio waves to the earth?
Q. Which of the following has longest wave length?
Q. Light waves are different from sound waves
Q. Why a solar cooker has a glass cover?
Q. Food is cooked faster in pressure cooker because
Q. Cooking some thing on a hill take long time than in the plain because
Q. The boiling point of water depends on
Q. The capacity of holding water vapour in the atmosphere
Q. Even in a hot day also the surface water of a pond remains cool because
Q. A person feels cold after a deep in sea water because
Q. Scalding with boiling water is less severe than scalding by steam because
Q. Perspiration (sweat) is maximum when
Q. Who was the first scientist to discover Electrons?
Q. What part of the atom has a positive charge?
Q. An atom with more neutrons than protons is called
Q. According to Rutherford's atomic model, the electrons inside an atom are
Q. A Step-Up transformer increases
Q. Steel is more elastic than rubber because it
Q. The spring constant of a spring depends on its
Q. An ideal gas cannot be
Q. Which law relates to the ideal gas law?
Q. Which of the metals has the maximum thermal conductivity?
Q. Which of the following is an example of simple harmonic motion?
Q. Period of oscillation of 3 cm microwaves in seconds is
Q. Which one of the following physical quantities has the same dimensions as that of Planck's constant?
Q. The wavelength of X - rays is of the order of 
Q. Which of the following is used in oven ?
Q. Electromagnetic waves are produced by
Q. Speed of sound in a gas is proportional to
Q. X - rays absorption will be maximum for the sheets of 
Q. Microwaves are electromagnetic waves with frequency, in the range of
Q. Doppler effect is independent of
Q. The ozone layer absorbs
Q. Which does not show polarisation ?
Q. Pitch is sensation which depends upon
Q. Red shift is an illustration of
Q. Sound waves do not exhibit the phenomenon of 
Q. SONAR is based on the principle of 
Q. Choose the correct statement 
Q. Which one of the following has highest frequency ?
Q. Decibel is a
Q. Ultrasonic waves can be detected by
Q. Mechanical waves
Q. Resonance is a special case of
Q. Ultrasonic waves are those waves which
Q. X- rays were discovered by
Q. The Doppler's effect is applicable for
Q. Which one of the following explains that all the galaxies are receding from us
Q. For harder X -rays