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- Question
At what temperature (in Fahrenheit) pure water freezes?
Options- A. 32
- B. 0
- C. 48
- D. 37
- Correct Answer
- 32
- 1. Which of the following is not a vector quantity?
Options- A. Momentum
- B. Displacement
- C. Torque
- D. Speed Discuss
- 2. Which of the following device is used to measure humidity?
Options- A. Hydrometer
- B. Hygrometer
- C. Psycho Meter
- D. Anemometer Discuss
- 3. 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
- 4. 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
- 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. Discuss
- 6. Addition of suitable impurities into semiconductor, is called
Options- A. Doping
- B. Mixing
- C. Forming
- D. Diluting Discuss
- 7. 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
- 8. 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
- 9. Consider the following statements : 1. There is no net moment on a body which is in equilibrium. 2. The momentum of a body is always conserved. 3. The kinetic energy of an object is always conserved. Which of the statements given above is/are correct?
Options- A. 1, 2 and 3
- B. 2 and 3 only
- C. 1 and 2 only
- D. 1 only Discuss
- 10. Working of safety fuses depends upon 1. magnetic effect of the current 2. chemical effect of the current 3. magnitude of the current 4. heating effect of the current Select the correct answer using the code given below.
Options- A. 1, 2, 3 and 4
- B. 1, 2 and 3 only
- C. 3 and 4 only
- D. 4 only Discuss
Physics problems
Search Results
Correct Answer: Speed
Correct Answer: Hygrometer
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: 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.
Correct Answer: 1 and 2 only
Explanation:
There are two conditions that must be met for an object to be in equilibrium. The first condition is that the net force on the object must be zero for the object to be in equilibrium. If net force is zero, then net force along any direction is zero.
Kinetic energy (KE) is the energy of motion, and kinetic energy is not always conserved in a collision
Energy and momentum are always conserved.
Correct Answer: 3 and 4 only
Explanation:
An electric fuse is a device which is used to limit the current in an electric circuit. The fuse safeguards the circuit and the electrical appliances from being damaged.
The fuse wire is generally an alloy of lead and tin. It has a low melting point and breaks the circuit if the current exceeds a safe value. The thickness and length of the fuse wire depends on the maximum current allowed through the circuit.
It is connected in series in the beginning of the electric circuits.
If too many electrical appliances of high power rating (like electric iron, water heater etc) are switched on at the same time, they draw an extremely large current from the circuit. This condition is called overloading and it can cause overheating of the wiring and lead to a fire. (heating effect and magnitude of the current)
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