Which mineral is also known as fool’s gold? (A) Quartz (B) Magneti (C) Pyrite (D) Fluorite Answer: (C) Pyrite More Question Question: The best malleable metal is – (A) Aluminum (B) Silver (C) Gold (D) Lead Answer Question: The early attempt to classify elements as metals and non-metals was made by – (A) Mendeleev (B) … Read more
Which of the following metals in pure form has the highest melting point? (A) Tungsten (B) Copper (C) Platinum (D) Gold Answer: (A) Tungsten More Question Question: The best malleable metal is – (A) Aluminum (B) Silver (C) Gold (D) Lead Answer Question: The early attempt to classify elements as metals and non-metals was made … Read more
A circular plate, a cube and a sphere, all made up of the 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? (1) Circular plate (2) Cube (3) Sphere (4) All will cool at the same rate Answer: (3) … Read more
When the speed of the car is doubled, then what will be the braking force of the car to stop it at the same distance? (1) four times (2) two times (3) half (4) one-fourth Answer: (1) Brake force, also known as Brake Power, is a measure of braking power of a vehicle. Suppose a car … Read more
Surface tension in a liquid is due to : (1) Adhesive force between molecules (2) Cohesive force between molecules (3) Gravitational force between molecules (4) Electrical force between molecules Answer: (2) Surface tension is a contractive tendency of the surface of a liquid that allows it to resist an external force. This property is caused by … Read more
What is found in frequency modulation? (1) Fixed frequency (2) Fixed dimension (3) Change in frequency and dimension (4) Change in dimension only Answer: (1) Frequency modulation (FM) conveys information over a carrier wave by varying its instantaneous frequency. This contrasts with amplitude modulation, in which the amplitude of the carrier is varied while its frequency … Read more
A boat will submerge when it displaces water equal to its own: (1) volume (2) weight (3) surface area (4) density Answer: (2) A boat will float when the weight of the water it displaces equals the weight of the boat and anything will float if it is shaped to displace its own weight of water … Read more
Which among the following waves is used for communication by artificial satellites? (1) Microwaves (2) Radio waves (3) A. M. (4) Frequency of 1016 series Answer: (1) For fixed (point-to-point) services, communications satellites provide a microwave radio relay technology complementary to that of communication cables. They are also used for mobile applications such as communications to … Read more
The splitting of different colours of light in a prism is : (1) Reflection of light (2) Dispersion of light (3) Diffraction of light (4) Refraction of light Answer: (2) The refractive index of many materials (such as glass) varies with the wavelength or colour of the light used, a phenomenon is known as dispersion. This … Read more
Which among the following types of coal produces the most heat per unit? (1) Coal (2) Lignite (3) Anthracite (4) Pit Answer: (3) The heat content of anthracite ranges from 22 to 28 million Btu per short ton (26 to 33 MJ/kg) on a moist, mineral-matter-free basis. Anthracite (“coal-like”) is a hard, compact variety of mineral … Read more