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- Question
A convex mirror is used to form an image of a real object. The image
Options- A. is diminished in size
- B. is erect
- C. always lies between the pole and the focus
- D. all of the above
- Correct Answer
- all of the above
- 1. Two metallic plate of equal thickness and coefficient thermal conductivity K1 and K2 put together face to face. A common plate is constructed. What is equivalent K?
Options- A. K1k2/k1+k2
- B. 2k1k2/k1+k2
- C. K1+k2/k1k2
- D. None Discuss
- 2. Which of the following is not a transverse wave?
Options- A. Light waves
- B. Radio waves
- C. Sound waves
- D. All the above Discuss
- 3. Decibel is the unit of
Options- A. speed of light
- B. intensity of sound
- C. intensity of heat
- D. None of these Discuss
- 4. "The Law of Kepler" is related with which among the following ?
Options- A. Planetary Motion
- B. Law of Conservation of energy
- C. Law of Gravitation
- D. None Discuss
- Kepler?s three laws of planetary motion can be stated as follows:
- 5. The inability of a body to change its state of rest or uniform motion along a straight line is called its
Options- A. momentum
- B. velocity
- C. acceleration
- D. inertia Discuss
- 6. The Capacity of a Communication Channel is Measured in
Options- A. Band rate
- B. Band width
- C. Data flow
- D. Bit capacity Discuss
- 7. Fog is an example of a
Options- A. liquid dispersed in gas
- B. solid dispersed in liquid
- C. liquid dispersed in solid
- D. gas dispersed in liquid Discuss
- 8. Reading of a barometer going down is an indication of
Options- A. Storm
- B. Rainfall
- C. Snow
- D. Intense heat Discuss
- 9. Brightness of bulb depends on voltage or current?
Options- A. Current
- B. Voltage
- C. Both A & B
- D. None Discuss
- 10. As the object covers equal distances in equal intervals of time, it is said to be in ____________ motion.
Options- A. uniform
- B. linear
- C. translational
- D. equilibrium Discuss
Physics problems
Search Results
Correct Answer: 2k1k2/k1+k2
Explanation:
We know that,
The equivalent K =
where L1 & L2 are plate1 & Plate2 thicknesses, K1 & K2 are coefficient thermal conductivity of plate1 & Plate2 respectively.
But here L1 = L2 = L (say)
Then K = L+L/(L/K1 + L/K2) =
Correct Answer: Sound waves
Explanation:
Correct Answer: intensity of sound
Correct Answer: Planetary Motion
Explanation:
Kepler's laws of planetary motion are three scientific laws describing the motion of planets around the Sun.
(1) All planets move about the Sun in elliptical orbits, having the Sun as one of the foci.
(2) A radius vector joining any planet to the Sun sweeps out equal areas in equal lengths of time.
(3) The squares of the sidereal periods (of revolution) of the planets are directly proportional to the cubes of their mean distances from the Sun.
Correct Answer: inertia
Explanation:
Flows out of Newton's first law of motion.
Correct Answer: Band width
Explanation:
The path that data takes from source to destination is called a Channel. A channel is a communication medium. A channel has a certain capacity for transmitting information.
The "capacity" of a channel is the theoretical upper-limit to the bit rate over a given channel that will result in negligible errors. Channel capacity is often measured by its Bandwidth in Hz or its data rate in bits per second.
Correct Answer: liquid dispersed in gas
Correct Answer: Rainfall
Explanation:
Barometer is instrument which is used to measure to pressure. A slow downfall of reading suggests a low pressure area is passing in a nearby region, it may rains. If the reading is going down very fast then its an indication of storm (within 5-6 hours).
Correct Answer: Both A & B
Explanation:
Brightness of bulb depends on both voltage and current. The brightness depends on power.
Since we know that Power (P) = Voltage x Current = V I
So whether you increase the current or the voltage the brightness will increase.
Example Illustration:
If you connect a long bulb and a round bulb in series, the long bulb glows but the round bulb does not. Both of them have the same current flowing through them (they are in series) but the long bulb has a greater voltage across it because it has more resistance (even though V= IR is not obeyed exactly, voltage drop does depend on the resistance). If you connect a round bulb and a long bulb in parallel, however, it is the round bulb that is brighter because now the voltage across both bulbs is the same but the current is larger through the round bulb (smaller resistance).
Hence, the brightness of a bulb depends on power i.e, both voltage and current.
Correct Answer: uniform
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