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- Question
Light year is a unit of
Options- A. time
- B. speed of light
- C. distance
- D. mass
- Correct Answer
- distance
- 1. Which metal is the best conductor of heat?
Options- A. Silver
- B. Gold
- C. Copper
- D. All of the above Discuss
- 2. Friction can be reduced by changing from
Options- A. Static to Dynamic
- B. Rolling to Sliding
- C. Dynamic to Static
- D. Sliding to Rolling Discuss
- 3. Electrical Pressure is also called
Options- A. Current
- B. Voltage
- C. Resistance
- D. Power Discuss
- 4. Is B2+ Paramagnetic or Diamagnetic? Discuss
- 5. What is the difference between Thermal Energy and Heat Energy? Discuss
- 6. Why does'nt the hydrogen atom emit X-rays?
Options- A. It is very small in size
- B. It has only one electron
- C. Its energy levels are very close to each other
- D. it is highly electropositive Discuss
- 7. Which of the following is a scalar quantity
Options- A. Displacement
- B. Electric field
- C. Acceleration
- D. work Discuss
- 8. Distance of stars are measured in
Options- A. Galactic unit
- B. seller mile
- C. Cosmic Kilometre
- D. Light year Discuss
- 9. Which law is also called law of inertia ?
Options- A. Newton first law
- B. Newton second law
- C. Newton third law
- D. All of above Discuss
- 10. A person is sitting in a moving train and is facing the engine. He tosses up a coin and the cion fals behind him. It can be concluded that the train is moving:
Options- A. forward and loosing speed
- B. forward and gaining speed
- C. forward and uniform speed
- D. backward with uniform speed Discuss
Physics problems
Search Results
Correct Answer: All of the above
Explanation:
Silver is the best conductor of both heat and electricity among metals with a thermal conduction value of about 430 W/(mK).
Gold and copper both come respectably close to silver.
Copper being significantly less costly it is often chosen over silver in many applications.
Correct Answer: Sliding to Rolling
Explanation:
Any object rolls when there is no friction. So, Sliding to Rolling is correct.
Correct Answer: Voltage
Explanation:
Electrical Pressure is also called as Voltage. Voltage is measured in Volts.
Volt : A unit of electrical pressure or Voltage is called Volt.
One volt is the amount of pressure required to cause one ampere of current to flow against one ohm of resistance.
Voltage is also referred to as Electromotive Force or Electrical Potential or Electrical Pressure.
Correct Answer: B2+ is a Paramagnetic The filled orbitals are ?(1s)2 2, ??(1s)2 2, ?(2s)2 2, ??(2s)2 2 The half-filled orbitals are ?(2px x) and ?(2py y) Since it posses 2 unpaired electrons, it is Paramagnetic in nature
Correct Answer: Energy tranfer takes place either by means of Heat or Work only in Thermodynamics Heat :: Heat Energy is defined as Energy that can be transferred due to temperature change Whereas Thermal Energy :: Thermal Energy is the Internal Energy stored in the system maintained at a certain Temperature
Correct Answer: Its energy levels are very close to each other
Explanation:
For an atom to emit X-rays it should have difference in energy levels
Correct Answer: work
Correct Answer: Light year
Correct Answer: Newton first law
Correct Answer: forward and gaining speed
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