Question: Hydrogen has the tendency to gain one electron to acquire helium configuration. In this tendency, it resembles
1. Alkali metals
2. Inert gases
3. Alkaline earth metals
4. Halogens
Answer: 4
Question: The ore of aluminium metal is
1. Cuprite
2. Galena
3. Bauxite
4. Zirconite
Answer: 3
Question: Carbonmonoxide reacts with H2 at 300$dGC to form
1. Ethane
2. Methane
3. Propane
4. Ethylene
Answer: 2
Question: The required DC voltage for arc welding is
1. 6 to 9 V
2. 50 to 60 V
3. 200 to 250 V
4. 90 to 100 V
Answer: 3
Question: For a body floating in water, the apparent weight is equal to
1. Actual weight of the body
2. Zero
3. Weight of the body minus weight of the liquid
4. Weight of the body plus upward thrust
Answer: 3
Question: Transfer of heat through horizontal movement of air is called
1. Convection
2. Advection
3. Radiation
4. Conduction
Answer: 2
Question: Which metal is not used as electromagnet?
1. Copper
2. Iron
3. Nickel
4. Cobalt
Answer: 1
Question: The primary colours are
1. blue, green and red
2. blue, yellow and red
3. yellow, orange and red
4. none of these
Answer: 1
Question: Which of the following is the hardest metal?
1. Gold
2. Iron
3. Platinum
4. Tungsten
Answer: 2
Question: Ice cubes are added to a glass of pure water and a glass of pure alcohol. The ice would be
1. At a higher level in water
2. At a higher level in alcohol
3. At the same level in both
4. Floating in water and sinking in alcohol
Answer: 4
Question: After long periods of use, a gray spot develops on the inside of a bulb. This is because
1. The tungsten filament evaporates and collects there
2. The heat of the bulb scorches the glass at the top
3. Dust inside the bulb condenses on the top
4. Glass undergoes a change due to the heat
Answer: 1
Question: The temperature which has the same reading on both Fahrenheit and Celsius scales is
1. 40°
2. -40°
3. -34°
4. -140°
Answer: 2
Question: Water boils at a lower temperature on the hills because
1. it is cold on the hills
2. there is less carbon dioxide on the hills
3. there is a decrease in air pressure on the hills
4. there is less oxygen
Answer: 3
Question: An air-conditioning system regulates
1. Temperature
2. Humidity
3. Air velocity
4. All of these
Answer: 3