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16. Gamma ray is highly energetic (NTSE West Bengal, Stage-I, 2015-16)
Electron
Proton
Electromagnetic wave
Neutron
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17. The radius of the nucleus of an atom of mass number A is proportional to (NTSE West Bengal, Stage-I, 2015-16)
A3/4
A2/3
A1/3
A5/3
18. A scientist wants to measure the value of acceleration due to gravity at a place, then the device selected by the scientist is (NTSE Karnataka, Stage-I, 2015-16)
Dynamo
Radar
Simple pendulum
Transducer
19. An electric motor requires 220 V alternating current to run but the supplied alternating voltage is 110 V. Then the device used to run the motor is (NTSE Kamataka, Stage-I, 2015-16)
Diode
Transistor
Transformer
Capacitor
20. Which of the following is the smallest unit? (NTSE Chhattisgarh, Stage-I, 2015-16)
Fermi
Micron
Milimeter
Kilometer
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