A. 63% tin and 37% lead B. 63% lead and 37% tin C. 63% tin and 37% aluminum D. 63% lead and 37% aluminum Fuse-wire Is made up of tin-lead alloy (63% tin + 37% lead). It should have low melting point and high resistivity. It is used in series as a safety device in … Read more
A. Carbon dioxide B. Chlorofluorocarbons C. Nitrogen oxides D. Methane The correct answer to the question: “Which one of the following is the main culprit in the thinning of Ozone layer in the earth’s stratosphere?” is “Chlorofluorocarbons”.
A. 20 dB B. 60 dB C. 100 dB D. 160 dB The correct answer to the question: “The approximate intensity level of the sound which can cause damage to the ear drum is?” is “100 dB”.
A. A single force B. Two forces acting in the same direction C. Two forces acting along different lines and in opposite direction. D. A pair of forces acting along the same line and in opposite direction The correct answer to the question: “Steering of a car involves?” is “A pair of forces acting along … Read more
A. Ductility B. Malleability C. Conductivity D. Density The correct answer to the question: “The property by virtue of which metals can be beaten into thin sheets is known as?” is “Malleability”.
A. Scatters blue light B. Reflects blue light C. Transmits blue light D. Has actual blue cover The correct answer to the question: “The sky appears blue because the earth’s atmosphere __________?” is “Scatters blue light”.
A. Prop him up if he falls B. Spread out his weight and reduce the pressure on the rope C. Add extra weight to keep the rope tightly stretched D. To keep the Center of gravity always above vertically above the rope The correct answer to the question: “A tight-rope walker carries a long pole … Read more
A. Water expands on freezing B. Bottle contracts at freezing point C. temperature outside the bottle is less than that inside the bottle. D. None of the above The correct answer to the question: “When water is filled in a bottle and is allowed to freeze, the bottle breaks because” is “Water expands on freezing”.
A. Beryllium B. Magnesium C. Aluminium D. None of These There are several metals which can be extracted from seawater and they are magnesium (Mg), sodium (Na), and calcium (Ca), out of them, sodium is one of the most common metal. The correct answer to the question: “Element extracted from Sea water?” is “Magnesium”.
A. Brick kilns B. Children toys C. Kitchen utilities D. Electric wires The correct answer to the question: “Copper is used in the production of___________?” is “Electric wires”.