Why is it necessary to make a physical contact between a thermocouple and the object for measuring its temperature?

Change in heat energy of the object when its temperature is changed:

Give an example of some familiar process in which heat is added to an object , without changing its temperature .

Select the appropriate options and complete the following paragraph : (heat,energy,decreasing, thermometer , increasing , potential, kinetic, atoms, thermal) Heat is a form of ………. Which flows from object at high temperature to the object at low temperature . Temperature of an object is measure of hotness and coldness of that object . it also is a measure of average .......... energy of atoms in the object . but the temperature cannot be measured accurately by just touching the object . hence , to measure temperature ........... is used . when a hot object is placed in contact with cold object , they exchange ............ . the average kinetic energy of atoms of cold objects goes on ........ . in this way , both the objects attain the same temperature when kept in contact .

A rope of mass 0.2 kg is connected at the same height of two opposite walls. It is allowed to hang under its own weight. At the contact point between the rope and the wall, the rope makes an angle theta=30%^(@) with respect to horizontal. The tension in the rope at its midpoint between the walls is

Heat absorbed by an object when its temperature changes is object when its temprature changes :_________.

Answer the following : What we can say that the two objects kept in contact have acquired equal temperature ?

A solid sphere and a hollow sphere of the same material and size are heated to the same temperature and allowed to cool in the same surroundings. If the temperature difference between each sphere and its surroundings is T then

Choose the correct alternative and write it along with its allotted alphabet: The image formed by a concave mirror is inverted and magnified when the object is ......... of the mirror. A. between the focus and the centre of curvature B. at the principal focus C. between the pole and the principal focus D. anywhere in front

Place two plane mirrors at an angle of 90^@ to each other. Place a small object between them. Images will be formed in both mirrors. How many images do you see? Now change the angle between the mirrors as given in the following table and count the number of images each time. How is this number related to the measure of the angle?

When a liquid is in contact with a solid , the angle between the surface of the solid and the tangent drawn to the surface of the liquid at that point of contact , measured on the side of the liquid , is called .