The average (arithmetic mean) of 5,10,15 and x is 20. What is the value of x?
- 10
- 15
- 20
- 30
- 50
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An alarm beeps 16 times per minute. how much time will it take to beep 88 times?
- 5 min 30 s.
- 5 min
- 4 min 30 s.
- 3 min 30 s.
- None of these
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A car consumes 20 litres of petrol to drive to 240 km, then how many litres are required to complete 600 km?
- 100L
- 70L
- 50L
- 40L
- Not Possible
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Rusting of Iron involves __?
- Reduction
- Decomposition
- Displacement
- Oxidation
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Atomic number of oxygen is:
- 5
- 8
- 11
- zero
- None of these
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Microphone converts sound energy into :
- Heat energy
- Electrical signals
- Optical Signals
- Microwaves
- both b & d
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Atomic number of nitrogen is ____?
- 5
- 6
- 7
- 8
- None of these
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Glass is made of the mixture of_________?
- Sand and quartz
- Sand and silicates
- Quartz and mica
- Salt and quartz
- Sand and salt
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Who invented Jet Engine______?
- Lewis E. Waterman
- Gottlieb Daimler
- Roger Bacon
- Sir Frank Whittle
- None of these
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Which one of the following companies will launch Project Skybender to boost 5G internet speed _________?
- Huawei
- IBM
- Apple
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