Sound waves cannot travel through a
Which one of the following is the correct relation between the Kelvin temperature (T) and the Celsius temperature (tc)?
Why is argon gas used along with tungsten wire in an electric bulb?
Which one of the following elements is essential for the formation of chlorophyll in green plants?
Which one of the following gases dissolves in water to give acidic solution?
Which one of the following elements is involved in the control of water content of the blood?
Which one of the following elements is used as a timekeeper in atomic clocks?
Which one of the following is the scientific name of the causal organism of elephantiasis?
Golden rice is a genetically-modified crop plant where the incorporated gene is meant for biosynthesis of
An object moves in a circular path with a constant speed. Which one of the following statements is correct?
The force acting on a particle of mass m moving along the x-axis is given by F(x) = Ax2 - Bx. Which one of the following is the potential energy of the particle?
In a vacuum, a five-rupee coin, a feather of a sparrow bird and a mango are dropped simultaneously from the same height. The time taken by them to reach the bottom is t1, t2 and t3 respectively. In this situation, we will observe that
Electron emission from a metallic surface by application of light is known as
How long does light take to reach the Earth from the Sun?
The mirrors used as rear-view mirrors in vehicles are
Which one of the following waves is used for detecting forgery in currency notes?
The ionization energy of hydrogen atom in the ground state is
When pure water boils vigorously, the bubbles that rise to the surface are composed primarily of
The compound C6H12O4 contains
Which of the following statements about magnetite ore of iron is/are correct?
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The term 'Probiotic' is applied to
Which one of the following microbes causes acidification and curdling of milk?
Water boils at a lower temperature at high altitudes, because
Concave mirror is used in headlights of vehicles, because it
If some object is weighed when submerged in water, what will happen to its weight compared to its weight in air?
Step-up transformers are used for
Which one among the following waves carries the maximum energy per photon?
How much CO2 is produced on heating of 1 kg of carbon?
Zinc is used to protect iron from corrosion because zinc is
Which one of the following gases is placed second in respect of abundance in the Earth's atmosphere?
Which one among the following chemicals is used as washing soda?
Why is potassium permanganate used for purifying drinking water?
A rainbow is produced due to which one of the following phenomena?
Bats detect obstacles in their path by receiving the reflected
Which one of the following waves does not belong to the category of the other three?
Which one of the following is a cause of acid rains?
The desirable range of pH for drinking water is
Consider the following reaction:
CH4 + 2O2 → CO2 + 2H2O
Which of the following about the reaction given above is/are correct?
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The speed of a body that has Mach number more than 1 is
The speed of a car travelling on a straight road is listed below at successive intervals of 1 s:
Time (s) 0 1 2 3 4
Speed (m/s) 0 2 4 6 8
Which of the following is/are correct?
The car travels
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At which place Earth’s magnetic field becomes horizontal?
An optical illusion which occurs mainly in deserts during hot summer is based on the principle of
Which one of the following devices changes low voltage alternating current to high voltage alternating current and vice versa?
Night blindness is caused by the deficiency of
Which one among the following is the richest source of vitamin C?
Which one of the following materials is not present in gun powder?
Which one of the following is a reducing substance?
Which one of the following non-metals is present in solid state?
Automobiles are fitted with a device that shows the distance travelled. Such a device is known as
Bose-Einstein Condensate (BEC) is formed by cooling a gas of extremely low density, about one-hundred-thousandth the density of normal air. This is treated as