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Physical quantities are
  • a)
    quantities such as degrees, radians and steradians
  • b)
    quantities such as pounds, dollars and rupees
  • c)
    quantities such as kilos, pounds and gallons
  • d)
    quantities such as length, mass, time, electric current, thermodynamic temperature, amount of substance, and luminous intensity
Correct answer is option 'D'. Can you explain this answer?
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Physical quantities area)quantities such as degrees, radians and stera...
A physical quantity is a quantity in physics that can be measured. Or a physical quantity is a physical property that can be quantified. Examples of physical quantities are mass, amount of substance, length, time, temperature, electric current, light intensity, force, velocity, density, and many others.
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Physical quantities area)quantities such as degrees, radians and stera...
Physical quantities are quantities that can be measured and expressed in numerical terms. They are classified into different categories based on their nature and characteristics. The correct option is 'D', which includes physical quantities such as length, mass, time, electric current, thermodynamic temperature, amount of substance, and luminous intensity. Let's discuss each of these quantities in detail:

1. Length:
- Length is a fundamental physical quantity that measures the extent of an object or the distance between two points.
- It is commonly measured in units such as meters (m), centimeters (cm), and kilometers (km).

2. Mass:
- Mass is a measure of the amount of matter present in an object.
- It is an intrinsic property of matter and remains constant regardless of the location.
- Mass is typically measured in units such as kilograms (kg) and grams (g).

3. Time:
- Time is a fundamental physical quantity that measures the sequence and duration of events.
- It plays a crucial role in various branches of science and is commonly measured in units such as seconds (s), minutes (min), and hours (h).

4. Electric current:
- Electric current is the flow of electric charge through a conductor.
- It is an important quantity in the field of electrical engineering and is measured in units called amperes (A).

5. Thermodynamic temperature:
- Thermodynamic temperature is a measure of the average kinetic energy of the particles in a substance.
- It is commonly measured in units such as Kelvin (K) and Celsius (°C).

6. Amount of substance:
- Amount of substance is a measure of the number of particles (atoms, molecules, or ions) in a sample.
- It is measured in units called moles (mol).

7. Luminous intensity:
- Luminous intensity is a measure of the power emitted by a light source in a particular direction.
- It is commonly measured in units called candela (cd).

These physical quantities are fundamental and play a crucial role in describing the properties and behavior of various objects and phenomena. They form the basis of many scientific theories and principles and are extensively used in various branches of science, engineering, and everyday life.
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Importance of high specific heat capacity of water for life Specific heat capacity of a substance is the amount of heat required to raise the temperature of that substance by 1 K. It is expressed in the units J/ (kg K). A high specific heat of a substance means that a large amount of heat is required to raise the temperature of the substance. Water has the highest known specific heat capacity. Its specific heat capacity is 4.186 K J/ (kg K) i.e. to raise the temperature of 1 kg of water by 1 Kelvin it requires 4.186 KJ of heat. For comparison sake, Copper requires only 385 Joules of heat to raise 1 kilogram of copper by 1 Kelvin. It also interesting to know that the specific heat capacities in two other phases of water (i.e. ice and water vapour) are less than this. High specific heat of water is mainly due to the presence of a large number of hydrogen bonds between molecules of water. On a beach on a sunny day, it is noticed that the sand is often quite hot to walk on, but the water is always cool, even in the shallows. This is because sand has a lower specific heat capacity than that of water. Sand takes less energy to raise the temperature by one degree. Because water has a high specific heat capacity, it requires more energy to raise the temperature by one degree. Since the sun puts same rate of energy on water and sand, which heats up sand more quickly and water more slowly. Water covers around 70% of the Earth's surface and its high specific heat plays a very important role to sustain life in the earth. It is able to absorb a lot of heat without a significant rise in the temperature. When temperatures decrease, the heat which is stored is released, restraining a rapid drop in temperature. The combined effect is the buffering of heat. A relatively constant temperature without sudden rise and drop is essential to sustain life. Hence water is important for life.Q. To raise the temperature of 1 kg of water and 1 kg of copper by 1 Kelvin, 4.186 KJ and 385 Joule of heat are required respectively. Which one will get heated up faster if exposed to sun?

Attempt All sub parts from each question.Triple Point: The temperature of a substance remains constant during its change of state (phase chang e). A graph between the temperature T and the Pressure P of the substance is called a phase diagram or P-T diagram. The following figure shows the phase diagram of water and CO2. Such a phase diagram divides the P-T plane into a solid-region, the vapour-region and the liquid-region. The regions are separated by the curves such as sublimation curve (BO), fusion curve (AO) and vaporisation curve (CO). The points on sublimation curve represent states in which solid and vapour phases coexist. The point on the sublimation curve BO represent states in which the solid and vapour phases coexist. Points on the fusion curve AO represent states in which solid and liquid phase coexist. Points on the vaporisation curve CO represent states in which the liquid and vapour phases coexist. The temperature and pressure at which the fusion curve, the vaporisation curve and the sublimation curve meet and all the three phases of a substance coexist is called the triple point of the substance.Q. During phase change of a substance

Importance of high specific heat capacity of water for life Specific heat capacity of a substance is the amount of heat required to raise the temperature of that substance by 1 K. It is expressed in the units J/ (kg K). A high specific heat of a substance means that a large amount of heat is required to raise the temperature of the substance. Water has the highest known specific heat capacity. Its specific heat capacity is 4.186 K J/ (kg K) i.e. to raise the temperature of 1 kg of water by 1 Kelvin it requires 4.186 KJ of heat. For comparison sake, Copper requires only 385 Joules of heat to raise 1 kilogram of copper by 1 Kelvin. It also interesting to know that the specific heat capacities in two other phases of water (i.e. ice and water vapour) are less than this. High specific heat of water is mainly due to the presence of a large number of hydrogen bonds between molecules of water. On a beach on a sunny day, it is noticed that the sand is often quite hot to walk on, but the water is always cool, even in the shallows. This is because sand has a lower specific heat capacity than that of water. Sand takes less energy to raise the temperature by one degree. Because water has a high specific heat capacity, it requires more energy to raise the temperature by one degree. Since the sun puts same rate of energy on water and sand, which heats up sand more quickly and water more slowly. Water covers around 70% of the Earth's surface and its high specific heat plays a very important role to sustain life in the earth. It is able to absorb a lot of heat without a significant rise in the temperature. When temperatures decrease, the heat which is stored is released, restraining a rapid drop in temperature. The combined effect is the buffering of heat. A relatively constant temperature without sudden rise and drop is essential to sustain life. Hence water is important for life.Q. Which statement is false?

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Physical quantities area)quantities such as degrees, radians and steradiansb)quantities such as pounds, dollars and rupeesc)quantities such as kilos, pounds and gallonsd)quantities such as length, mass, time, electric current, thermodynamic temperature, amount of substance, and luminous intensityCorrect answer is option 'D'. Can you explain this answer?
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Physical quantities area)quantities such as degrees, radians and steradiansb)quantities such as pounds, dollars and rupeesc)quantities such as kilos, pounds and gallonsd)quantities such as length, mass, time, electric current, thermodynamic temperature, amount of substance, and luminous intensityCorrect answer is option 'D'. Can you explain this answer? for Class 11 2024 is part of Class 11 preparation. The Question and answers have been prepared according to the Class 11 exam syllabus. Information about Physical quantities area)quantities such as degrees, radians and steradiansb)quantities such as pounds, dollars and rupeesc)quantities such as kilos, pounds and gallonsd)quantities such as length, mass, time, electric current, thermodynamic temperature, amount of substance, and luminous intensityCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for Class 11 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Physical quantities area)quantities such as degrees, radians and steradiansb)quantities such as pounds, dollars and rupeesc)quantities such as kilos, pounds and gallonsd)quantities such as length, mass, time, electric current, thermodynamic temperature, amount of substance, and luminous intensityCorrect answer is option 'D'. Can you explain this answer?.
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