Physics problems
- 1. An electron and a proton starting from rest get accelerated through potential difference of 100kV. The final speeds of the electron and the proton are Ve and Vp respectively. Which of the following relations is correct?
Options- A. Ve > Vp
- B. Ve < Vp
- C. Ve = Vp
- D. Cannot be determined Also asked in: Bank Exams
Correct Answer: Ve > Vp
Explanation:
Both when accelerated through a potential difference of 100KV, they will have the same energy. The mass of the electron is less than the mass of a proton, hence it will move faster(momentum).
- 2. Which of the following is/are state function / functions? 1. q + w 2. q 3. w 4. H -TS Select the correct answer using the code given below.
Options- A. 1 and 4 only
- B. 1, 2 and 4
- C. 2, 3 and 4
- D. 1 only Also asked in: Bank Exams
Correct Answer: 1 and 4 only
Explanation:
Q and w are path functions while q+w i.e. H, enthalpy is state function. Similarly, H-TS i.e. G, Gibbs free energy is state function.
- 3. For a certain reaction,DGq = -45 kJ/mol and DHq= -90 kJ/mol at 0°C. What is the minimum temperature at which the reaction will become spontaneous, ifDHq and DSq are independent of temperature?
Options- A. 273 K
- B. 298 K
- C. 546 K
- D. 596 K Also asked in: Bank Exams
Correct Answer: 546 K
Explanation:
T = 273 °K
Using the formula,
DGq = DHq ?TDS
-45 = -90 ?273 DS
DS = 0.164
Now since DHq and DSq are independent,T2= DH/DS = 45/0.164 = 273°K
Required Temp = 273 + 273 = 546°K
- 4. In spherical polar coordinates (l, q, a), q denotesthe polar angle around z-axis and a denotes the azimuthal angle raised from x-axis . Then the y-component of P is given by
Options- A. Psinq sina
- B. Psinq cosa
- C. Pcosq sina
- D. Pcosq cosa Also asked in: Bank Exams
Correct Answer: Psinq sina
Explanation:
The Cartesian Coordinates can be retrieved from spherical coordinates (l,q,a) by:
X = r.sinq.cosa
Y = r.sinq.sina
Z = r.sinq
Using the same we get for P,
Y = P.sinq.sina
- 5. For an ideal gas, which one of the following statements does not hold true?
Options- A. The speed of all gas molecules is same
- B. The kinetic energies of all gas molecules are not same
- C. The potential energy of the gas molecules is zero
- D. There is no interactive force between the molecules. Also asked in: Bank Exams
Correct Answer: The speed of all gas molecules is same
Explanation:
In an ideal gas, at any particular time, different particles in the gas have different speeds and hence different kinetic energies. This assumption is reasonable because as the particles collide, we expect their speed to change. Even if initial speed of all the particles was same, the molecular collisions will disrupt this uniformity.Hence statement 1 is incorrect and 2 is correct.
- 6. The Hooke's law is valid for
Options- A. only proportional region of the stress strain curve
- B. entire stress strain curve
- C. entire elastic region of the stress strain curve
- D. elastic as well as plastic region of the stress strain curve Also asked in: Bank Exams
Correct Answer: only proportional region of the stress strain curve
Explanation:
Hooke's law states that within the elastic limit, stress developed is directly proportional to the strain produced in a body.Hooke?s law is valid only in the linear part of stress-strain curve. Hence, statement 1 is correct.
- 7. Which one of the following is the correct sequence of passage of light in a compound microscope?
Options- A. Condenser -Objective lens -Eye -piece -Body tube
- B. Objective lens -Condenser -Body tube -Eye piece
- C. Condenser -Objective lens -Body tube -Eyepiece
- D. Eyepiece -Objective lens -Body tube -Mirror Also asked in: Bank Exams
Correct Answer: Condenser -Objective lens -Body tube -Eyepiece
- 8. Which of the following device is used to measure humidity?
Options- A. Hydrometer
- B. Hygrometer
- C. Psycho Meter
- D. Anemometer Also asked in: Bank Exams
Correct Answer: Hygrometer
- 9. Which of the following is not a vector quantity?
Options- A. Momentum
- B. Displacement
- C. Torque
- D. Speed Also asked in: Bank Exams
Correct Answer: Speed
- 10. At what temperature (in Fahrenheit) pure water freezes?
Options- A. 32
- B. 0
- C. 48
- D. 37 Also asked in: Bank Exams
Correct Answer: 32
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