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- Question
As water is cooled from 4 deg C to 0 deg C, its density
Options- A. increases
- B. decreases
- C. remains same
- D. None of the above
- Correct Answer
- decreases
ExplanationAs water is cooled from 4 deg C to 0 deg C, the water reaches its freezing point and starts forming ice crystals. Then the volume of that ice cubes increases and its density decreases. Hence, it is the reason that ice will float on water as ice has less density than the water.
- 1. The humidity of the air depends upon
Options- A. Weather
- B. Temperature
- C. Location
- D. All of the above Discuss
- 2. Blotting paper absorbs ink due to
Options- A. Capillary action phenomenon
- B. Diffusion of ink through the blotting
- C. Siphon action
- D. Viscosity of ink Discuss
- 3. Buoyancy depends on
Options- A. the mass of the liquid displaced
- B. the mass of the body
- C. the depth to which the body is immersed
- D. the shaped of the body Discuss
- 4. which is a best way to measure Ground Distance? Discuss
- 5. The purpose of choke in tube light is
Options- A. Induce high voltage
- B. Induce low resistance
- C. Induce high resistance
- D. Induce low voltage Discuss
- 6. A dynamometer wattmeter can be used for
Options- A. Only Direct Current
- B. Only Active Current
- C. Both A & B
- D. None of the above Discuss
- 7. Number of basic SI unit is
Options- A. 4
- B. 7
- C. 6
- D. 5 Discuss
- 8. Curie is the unit of
Options- A. temparature
- B. radio activity
- C. heat
- D. energy Discuss
- 9. Which of the following physical quantities have the same dimensions
Options- A. momentum and impulse
- B. power and young modulus
- C. Energy and angular Momentum
- D. force constant and moment of inertia Discuss
- 10. Which one of the following groups have quantities that do not have the same dimensions
Options- A. pressure, stress
- B. velocity, speed
- C. force, impulse
- D. work, energy Discuss
Physics problems
Search Results
Correct Answer: All of the above
Explanation:
Humidity means the amount of watervapour present in the atmosphere. It depends on weather, location and temperature of the place.
Correct Answer: Capillary action phenomenon
Explanation:
Blotting paper absorbs ink by the process of capillary action. The capillary action is based on the property of surface tension of liquid.
All unsized paper will absorb water. Blotting paper is not sized and made bulkier to provide capillary action for faster absorption of liquid.
Blotting paper has also been sold as a cosmetic to aid in the removal of skin oils and makeup.
Correct Answer: the mass of the liquid displaced
Explanation:
Buoyancy or Upthrust, is an upward force exerted by a fluid that opposes the weight of an immersed object.
In a column of fluid, pressure increases with depth as a result of the weight of the overlying fluid.
Correct Answer: Pace Count is a way to measure to Ground Distance Pace Count is nothing but regular single natural step of about 30 inches long
Correct Answer: Induce high voltage
Explanation:
When the switch is ON, in a tube light choke is nothing but the coil/ballast ( inductor) which is used to induce the high voltage across it. as we know that inductor has property to induce high voltage for the brief period of time, this high voltage is required to ionize the gases in the starter.
Then gas inside the starter gets ionized due to this full voltage and heats the bimetallic strip that is caused to be bent to connect to the fixed contact. Current starts flowing through the starter. Although the ionization potential of the neon is the little bit more than that of the argon but still due to small electrode gap high voltage gradient is appeared in the neon bulb and hence glow discharge is started first in a starter.
As voltage gets reduced due to the current causes a voltage drop across the inductor, the strip cools and breaks away from the fixed contact. At that moment a large L di/dt voltage surge comes across the inductor at the time of breaking.
This high valued surge comes across the tube light electrodes and strikes penning mixture (mixture argon gas and mercury vapor).
Gas discharge process continues and current gets the path to flow through the tube light gas only due to low resistance as compared to the resistance of starter.
Correct Answer: Both A & B
Correct Answer: 7
Correct Answer: radio activity
Correct Answer: momentum and impulse
Correct Answer: force, impulse
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