Heat from the Sun reaches the Earth by (1) Reflection (2) Conduction (3) Radiation (4) Convection Answer: (3) The radiation (light, heat, etc.) travels through the intervening 150, 000,000 kilometres in 8 minutes. Radiation is a process in which energetic particles or energetic waves travel through a vacuum, or through matter-containing media that are not required … Read more
When a barometer reading suddenly recedes, it indicates that climate– (1) will be very warm (2) will be extremely stormy (3) will remain cold (4) incessant rain for at least 48 hours Answer: (2) In summer, when the barometer falls suddenly, a thunderstorm can be expected, and if it does not rise again upon its cessation, … Read more
What is the colour of light related to? (1) Amplitude (2) Frequency (3) Quality (4) Velocity Answer: (1) Colour or colour is the visual perceptual property corresponding in humans to the categories called red, green, blue, and others. Colour derives from the spectrum of light (distribution of light power versus wavelength) interacting in the eye with … Read more
The term ‘equinox’ means (1) The path which the Earth takes around the Sun (2) The axis of the Earth around which it rotates (3) When the day and night are of equal duration (4) The time when the Sun seems to be going round and round in the sky in the Arctic but does … Read more
While catching a ball, a player pulls down his hands to lower the– (1) force (2) momentum (3) impulse (4) catching time Answer: (2) A cricketer lowers his hands while taking a catch to decrease the rate of momentum. Cricketers increase the time by pulling their hand’s backward with the ball while taking a catch. Linear … Read more
Which set of conditions represents the easiest way to liquify a gas? (1) Low temperature and high pressure (2) High temperature and low pressure (3) Low temperature and low pressure (4) High temperature and high pressure Answer: (1) Low temperature and high-pressure set of conditions represent the easiest way to liquefy a gas. Liquefaction of gases … Read more
Which of the following is a non-renewable source of energy? (1) Biogas (2) Solar (3) Wind (4) Coal Answer: (4) A non-renewable resource is a natural resource that cannot be reproduced, grown, generated, or used on a scale that can sustain its consumption rate. So, coal is a non-renewable source of energy. Once it is depleted, … Read more
Mist is caused by (1) dry ice (2) ice at low temperature (3) water vapour at low temperature (4) carbon-monoxide in solid form Answer: (3) Mist is a phenomenon caused by small droplets of water suspended in the air. It can occur as part of natural weather or volcanic activity, and is common in cold air … Read more
The substance which conducts current in the solid-state is (1) diamond (2) graphite (3) iodine (4) sodium chloride Answer: (2) The structure of graphite is unlike most other network substances. It is formed in ‘sheets’ of carbon atoms, each of which is bonded to only three others. The fourth valence electron of the carbon atom is … Read more
Good conductor of electricity is (1) dry air (2) paper (3) kerosene (4) graphite Answer: (4) Graphite has a tendency to behave very much like metal because the carbon molecules arrange themselves into a lattice structure. The crystal lattice is the same orientation that metal forms, and it allows the free movement of electrons, making it … Read more