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- Question
Which of the following device is used to measure humidity?
Options- A. Hydrometer
- B. Hygrometer
- C. Psycho Meter
- D. Anemometer
- Correct Answer
- Hygrometer
- 1. 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 Discuss
- 2. 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 Discuss
- 3. 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. Discuss
- 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 Discuss
- 5. 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 Discuss
- 6. Which of the following is not a vector quantity?
Options- A. Momentum
- B. Displacement
- C. Torque
- D. Speed Discuss
- 7. At what temperature (in Fahrenheit) pure water freezes?
Options- A. 32
- B. 0
- C. 48
- D. 37 Discuss
- 8. Addition of suitable impurities into semiconductor, is called
Options- A. Doping
- B. Mixing
- C. Forming
- D. Diluting Discuss
- 9. Sound waves can not travel through a
Options- A. copper wire placed in air
- B. silver slab placed in air
- C. glass prism placed in water
- D. wooden hollow pipe placed in vacuum Discuss
- 10. Which one of the following is the value of one nanometer?
Options- A. 10-7 cm
- B. 10-6 cm
- C. 10-4 cm
- D. 10-3 cm Discuss
Physics problems
Search Results
Correct Answer: Condenser -Objective lens -Body tube -Eyepiece
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.
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.
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
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
Correct Answer: Speed
Correct Answer: 32
Correct Answer: Doping
Correct Answer: wooden hollow pipe placed in vacuum
Explanation:
Sound is a kind of energy created when something vibrates. When this vibration reaches an ear, it is translated into what we recognize as a sound. Sound vibration must travel through matter. Therefore, it can travel through air and water but not through vacuum.
Correct Answer: 10-7 cm
Explanation:
1 nanometer (nm) of length
Equals: 0.00000010 centimetres (cm) in length.
This is equal to 10^-7 cm.
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