Question 171
In photoelectric effect, what happens if the frequency of incident light is below the threshold frequency?Modern PhysicsPhotoelectric Effecthard
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Question 172
Which of the following best explains why metals are good conductors of heat?HeatHeat and Thermodynamicsmedium
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Question 173
A wave has a frequency of 500 Hz and a wavelength of 0.68 m. What is the speed of the wave?WavesWaves and Oscillationsmedium
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Question 174
Which physical quantity is conserved when a ball bounces elastically on the ground?EnergyEnergy and Workmedium
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Question 175
What is the magnetic effect of a current-carrying conductor?MagnetismElectricity and Magnetismeasy
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Question 176
Which of these particles was discovered using a cathode ray tube?Modern PhysicsModern Physics and Atomic Structuremedium
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Question 177
If the length of a pendulum is quadrupled, how does its period change?MechanicsMechanics and Motionmedium
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Question 178
A radioactive isotope has a half-life of 4 hours. How much of a 16 g sample remains after 12 hours?Modern PhysicsRadioactivity and Nuclear Physicshard
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Question 179
Which instrument is used to measure electric current?ElectricityElectricityeasy
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Question 180
What is the unit of force in the SI system?MeasurementsMeasurementseasy
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