Practice free Physics NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
If a liquid is heated in weightlessness, the heat is transmitted through
(a) Convection is not possible in weightlessness. So the liquid will be heated through conduction.
In which of the following process, convection does not take place primarily ?
(c) In warming of glass of bulb, the energy is transfered due to radiation mostly.
On a clear sunny day, an object at temperature T is placed on the top of a high mountain. An identical object at the same temperature is placed at the foot of mountain. If both the objects are exposed to sun-rays for two hours in an identical manner, the object at the top of the mountain will register a temperature
(b) Because of uneven surfaces of mountains, most of it's parts remain under shadow. So, most of the mountains land is not heated up by sun rays. Besides this, sun rays fall slanting on the mountains and are spread over a larger area. So, the heat received by the mountains top per unit area is less and they are less heated compared to planes (Foot).
Heat travels through vacuum by
(c) Heat radiations are electromagnetic waves of high wavelength.
We consider the radiation emitted by the human body. Which of the following statements is true ?
(d) Every body at all time, at all temperatures emits radiation (except at T=0 ). The radiation emitted by the human body is in the infra-red region.
The earth radiates in the infra-red region of the spectrum. The spectrum is correctly given by
(c)
Pick out the statement which is not true .
(b)
A hot and a cold body are kept in vacuum separated from each other. Which of the following cause decrease in temperature of the hot body ?
(a) In vacuum heat flows by the radiation mode only.
For a perfectly black body, its absorptive power is
(a) A perfectly black body is a good absorber of radiations falls on it. So it’s absorptive power is 1.
Certain substance emits only the wavelengths and when it is at a high temperature. When this substance is at a colder temperature, it will absorb only the following wavelengths ?
(d) According to Kirchoff’s law in spectroscopy. If a substance emit certain wavelengths at high temperature, it absorbs the same wavelength at comparatively lower temperature.
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The bank mixes NEET previous year questions (PYQs) with practice questions, each tagged with its exam appearances where applicable.