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- Question
When a bottle of perfume is opened in one corner of a room the smell spreads soon throughout the room. This is an example of
Options- A. surface tension
- B. capillarity
- C. viscosity
- D. diffusion
- Correct Answer
- diffusion
ExplanationDiffusion is the spreading - mixing of gases through molecular motion.
- 1. Rain drops acquire spherical shape due to
Options- A. viscosity
- B. surface tension
- C. friction
- D. elasticity Discuss
- 2. If a sound travels from air to water, the quantity that remain unchanged is
Options- A. velocity
- B. frequency
- C. wavelength
- D. amplitude Discuss
- 3. An air bubble in water will act like a
Options- A. convex lens
- B. convex mirror
- C. concave lens
- D. concave mirror Discuss
- 4. Two electric bulbs marked 25W ? 220V and 100W ? 220V are connected in series to a 440Vsupply. Which of the bulbs will fuse?
Options- A. 25 W
- B. Both
- C. 100 W
- D. Neither Discuss
- 5. Which of the following is not the unit of time
Options- A. Parallactic second
- B. Micro Second
- C. Leap year
- D. Solar day Discuss
- 6. It is more difficult to walk on ice than on a concrete road because
Options- A. there is very little friction between the ice and feet pressing it
- B. ice is soft when compared to concrete
- C. there is more friction between the ice and feer
- D. None of these Discuss
- 7. A solid ball of metal has a spherical cavity inside it. When the ball is heated the volume of the cavity will
Options- A. increase
- B. decrease
- C. remain unaffected
- D. have its shape changed Discuss
- 8. What is the SI unit of pressure
Options- A. Pascal
- B. Dyne
- C. Newton
- D. Jule Discuss
- 9. Ultrasonic waves are used for stirring liquid solutions because they
Options- A. do not produce noise during the operation
- B. are easy to produce
- C. can produce perfectly homogeneous solutions
- D. do not produce chemical reactions in the solution Discuss
- 10. The core of an electromagnet is made of soft iron because soft iron has
Options- A. small susceptibility and small retentivity
- B. large susceptibility and small retentivity
- C. large density and large retentivity
- D. small density and large retentivity Discuss
Physics problems
Search Results
Correct Answer: surface tension
Correct Answer: frequency
Correct Answer: concave lens
Correct Answer: 25 W
Explanation:
Resistances of both the bulbs are
R1=V^2/P1 = 220^2/25
R2 = V^2/P2 = 220^2/100
Hence
When connected in series, the voltages divide in them in the ratio of their resistances. The voltage of 440 V devides in such a way that voltage across 25 w bulb will be more than 220 V. Hence 25 w bulb will fuse.
Correct Answer: Parallactic second
Correct Answer: there is very little friction between the ice and feet pressing it
Explanation:
It is the friction between the feet and the ground that helps us to walk. Without this friction we would slip and fall
Correct Answer: increase
Explanation:
The metal ball can be considered to be made up of several layers of thinner ones. On heating each of these layers will increase in radius. As the inner most layer also increases its radius, the volume inside it i.e, the volume of the hollow portion will also increase.
Correct Answer: Pascal
Correct Answer: can produce perfectly homogeneous solutions
Correct Answer: large susceptibility and small retentivity
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