Which of the above activities can be successfully carried out by using drones ?
Consider the following activities : 1.Spraying pesticides on a crop field 2.Inspecting the craters of active volcanoes 3.Collecting breath samples from spouting whales for DNA analysis At the present level of technology Which of the above activities can be successfully carried out by using drones ?(2020) a) 1 and 2 only b) 2 and 3 […]
The experiment will employ a trio of spacecraft flying in formation in the shape of an equilateral triangle that has sides one million kilometres long
The experiment will employ a trio of spacecraft flying in formation in the shape of an equilateral triangle that has sides one million kilometres long, with lasers shining between the craft.” The experiment in question refers to(2020) a) Voyager-2 b) New Horizons c) LISA Pathfinder d) Evolved LISA Answer: D Evolved Laser Interferometer Space Antenna […]
Which of the statements given above is/are correct ?(2020)
Consider the following statements : 1.Genetic changes can be introduced in the cells that produce eggs or sperms of a prospective parent. 2.A person’s genome can be edited before birth at the early embryonic stage. 3.Human induced pluripotent stem cells can be injected into the embryo of a pig. Which of the statements given above […]
During a thunderstorm, the thunder in the skies is produced by the
During a thunderstorm, the thunder in the skies is produced by the 1. meeting of cumulonimbus clouds in the sky 2. lightning that separates the nimbus clouds 3. violent upward movement of air and water particles Select the correct answer using the codes given below.(2013) a) 1 only b) 2 and 3 c) 1 and […]
Fruits stored in a cold chamber exhibit longer storage life because
Fruits stored in a cold chamber exhibit longer storage life because(2013) a) exposure to sunlight is prevented b) concentration dioxide in the is increased of carbon environment c) rate of respiration is decreased d) there is an increase in humidity Answer: C Fruits respire. They give out ethylene which helps in ripening. When fruits are […]
Ball Bearings Are Used in bicycles, cars, etc., Because
Ball bearings are used in bicycles, cars, etc., because(2013) a) the actual between the is increased area of contact wheel and axle b) the effective between the is increased area of contact wheel and axle c) the effective between the is reduced area of contact wheel and axle d) None of the above statements is […]
Which of the above are optical illusions?
Consider the following phenomena: 1. Size of the sun at dusk 2. Colour of the sun at dawn 3. Moon being visible at dawn 4. Twinkle of stars in the sky 5. Polestar being visible in the sky Which of the above are optical illusions?(2013) a) 1, 2 and 3 b) 3, 4 and 5 […]
Which of the following physical phenomena are responsible for this?
Rainbow is produced when sunlight falls on drops of rain. Which of the following physical phenomena are responsible for this? 1. Dispersion 2. Refraction 3. Internal reflection Select the correct answer using the codes given below.(2013) a) 1 and 2 only b) 2 and 3 only c) 1 and 3 only d) 1, 2 and […]
Many Transplanted Seedlings do not grow because
Many transplanted seedlings do not grow because(2013) a) the new soil does not contain favourable minerals b) most of the root hairs grip the new soil too hard c) most of the root hairs are lost during transplantation d) leaves get damaged during transplantation Answer: C Many transplanted seedlings do not grow because most of […]
Select the correct answer using the codes given below
Which of the following statements is / are correct? 1. Viruses lack enzymes necessary for the generation of energy. 2. Viruses can be cultured in any synthetic medium. 3. Viruses are transmitted from one organism to another by biological vectors only. Select the correct answer using the codes given below.(2013) a) 1 only b) 2 […]