Question: Speed of sound is maximum in:
1. Gas
2. Same in all cases
3. Liquid
4. Solid
Answer: 4
Question: Newton is a unit of:
1. Force
2. Acceleration
3. Work
4. Energy
Answer: 1
Question: The mass of a body at the centre of earth is:
1. Zero
2. Remains constant
3. More than at the surface
4. Less than at the surface
Answer: 2
Question: 1 Joule is equivalent to
1. 103ergs
2. 105 ergs
3. 107ergs
4. 1011
Answer: 3
Question: The coating of a thin layer of zinc on steel or iron objects is known as
1. Galvanising
2. Hot dipping
3. Tinning
4. Electroplating
Answer: 1
Question: Electric current in a metal wire is due to the flow of
1. Protons
2. Electrons
3. Ions
4. None of these
Answer: 2
Question: Optic fibres are mainly used for
1. Weaving
2. Communication
3. Musical instruments
4. Food industry
Answer: 2
Question: Which among the following is a chemical change?
1. A wet towel dries in the sun
2. Lemon juice added to tea causing its colour to change
3. Coffee is brewed by passing steam through ground coffee
4. Hot air rises over a radiator
Answer: 2
Question: Which of the following is a vector quantity?
1. Force
2. Temperature
3. Energy
4. Momentum
Answer: 1
Question: At what point the Centigrade and the Fahrenheit temperatures are the same?
1. 10 degree
2. 0 degree
3. -10 degree
4. -40 degree
Answer: 4