Absorption and Emission MCQ

Test your knowledge with important Absorption and Emission MCQ and their applications. These MCQs are beneficial for competitive exams too. Explore 30 + more Absorption and Emission MCQs at Bissoy

• During constant temperature, we feel colder on the day when the humidity is ___________
  ক

  85%

  খ

  40%

  গ

  60%

  ঘ

  25%
• The triple point of water is ___________
  ক

  273.16°C

  খ

  273.16K

  গ

  273.16°F

  ঘ

  0.15K
• A black body at 200 K is found to emit maximum energy at a wavelength 14μm. When its temperature is raised to 1000K, then wavelength at which maximum energy emitted it?
  ক

  14mm

  খ

  7μm

  গ

  2.8μm

  ঘ

  28mm
• A black body radiates energy at the rate of 1×105 J/(sm)2 at a temperature of 227°C. The temperature to which it must be heated so that it radiates energy at the rate of 1×109 J/(sm)2.
  ক

  5000 K

  খ

  5000°C

  গ

  500 K

  ঘ

  500°C
• A perfectly black body is one whose ___________
  ক

  Absorptive power is 1

  খ

  Absorptive power is 0

  গ

  Emissive power is 1

  ঘ

  Absorptive power is 0.5
• Mud houses are cooler in summer and warmer in winter because ___________
  ক

  Mud is a good conductor of heat

  খ

  Mud is a superconductor of heat

  গ

  Mud is a bad conductor of heat

  ঘ

  Mud can adapt according to temperature
• Two rods having thermal conductivity in the ratio of 5:3 having equal lengths and equal cross-sectional area are joined end to end. If the temperature of the free end of the first rod is 100°C and free end of the second rod is 20°C, then the temperature of the junction is?
  ক

  50°C

  খ

  70°C

  গ

  60°C

  ঘ

  90°C
• A body A of mass 0.5kg and specific heat 0.85 is at a temperature of 60°C. Another body B of mass 0.3kg and specific heat 0.9 is at a temperature of 90°C. When they are connected to a conducting rod, heat will flow from ___________
  ক

  A to B

  খ

  Heat can’t flow

  গ

  B to A

  ঘ

  First A to B and then B to A
• In order that the heat flows from one part of a solid to another part, what is required?
  ক

  Uniform density

  খ

  Temperature gradient

  গ

  Density gradient

  ঘ

  Uniform temperature
• If the temperature of a rod is increased by 10°C, its length increases by 1%. What is the percentage change in volume of the body of the same material for 10°C increase in temperature?
  ক

  9%

  খ

  1%

  গ

  5%

  ঘ

  3%
• Amount of heat required to raise the temperature of a body through 1K is called ___________
  ক

  Specific heat

  খ

  Thermal capacity

  গ

  Water equivalent

  ঘ

  Entropy
• The coefficient of volumetric expansion of mercury is 18×10-5/°C. The thermometer bulb has a volume of 10-6 m3 and cross-section of the stem is 0.002cm2. Assuming that bulb is filled with mercury at 0°C, the increase in length of the mercury column at 100°C will be ___________
  ক

  9cm

  খ

  9mm

  গ

  18cm

  ঘ

  18mm
• Density of substance at 0°C is g/cc and 100°C, its density is 9.7g/cc. The coefficient of linear expansion of the substance is?
  ক

  10-1

  খ

  10-2

  গ

  10-3

  ঘ

  10-4
• The volume of a gas at 20°C is 100cm3 at normal pressure. If it is heated to 100°C, its volume becomes 125cm3 at the same pressure, then volume coefficients of the gas (at normal pressure) is?
  ক

  0.0033/°C

  খ

  0.0025/°C

  গ

  0.0030/°C

  ঘ

  0.0021/°C
• At which temperature, the centigrade and Fahrenheit scales are equally?
  ক

  40°

  খ

  -40°

  গ

  37°

  ঘ

  -80°