MCQOPTIONS
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MCQOPTIONS
This section includes 657 Mcqs, each offering curated multiple-choice questions to sharpen your Testing Subject knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
In an electron microscope, electrons are accelerated through a potential difference of 200kV. What is the best possible resolution of the microscope? (Specify your answer to two digits after the decimal point.) |
| A. | 0.275 |
| B. | 1 |
| C. | 0.575 |
| D. | 0.580 |
| Answer» B. 1 | |
| 2. |
For a proton to capture an electron to form a neutron and a neutrino (assumed massless), the electron must have some minimum energy. For such an electron the de Broglie wavelength in picometers is ______. (Specify your answer to two digits after the decimal point.) |
| A. | 3.20 |
| B. | 2.10 |
| C. | 2 |
| D. | 3.20 |
| Answer» C. 2 | |
| 3. |
Consider a Carnot engine operating between temperatures of 600K and 400K. The engine performs 1000 J of work per cycle. The heat (in Joules) extracted per cycle from the high temperature reservoir is __________. (Specify your answer to two digits after the decimal point.) |
| A. | 3000 |
| B. | 4000 |
| C. | 4500 |
| D. | 5000 |
| Answer» B. 4000 | |
| 4. |
Sand falls on a conveyor belt at the rate of 1.5 kg/s. If the belt is moving with a constant speed of 7m/s, the power needed to keep the conveyor belt running is ________. (Specify your answer to two digits after the decimal point.) |
| A. | 72 |
| B. | 73.5 |
| C. | 75 |
| D. | 89 |
| Answer» C. 75 | |
| 5. |
Two beams of light in the visible range (400 nm – 700 nm) interfere with each other at a point. The optical path difference between them is 5000 nm. Which of the following wavelengths will interfere constructively at the given point ? |
| A. | 415.67 nm |
| B. | 556.55 nm |
| C. | 625 nm |
| D. | 666.66 nm |
| Answer» D. 666.66 nm | |
| 6. |
Consider an ensemble of thermodynamic systems, each of which is characterized by the same number of particles, pressure and temperature. The thermodynamic function describing the ensemble is |
| A. | Enthalpy |
| B. | Helmholtz free energy |
| C. | Gibbs free energy |
| D. | Entropy |
| Answer» D. Entropy | |
| 7. |
An ideal gas consists of three dimensional polyatomic molecules. The temperature is such that only one vibrational mode is excited. If R denotes the gas constant, then the specific heat at constant volume of one mole of the gas at this temperature is |
| A. | 3R |
| B. | 7/2R |
| C. | 4R |
| D. | 9/2R |
| Answer» D. 9/2R | |