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Physics

Physics
For which Diode is used ?

Oscillation
Modulation
Purification
Amplification

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Physics
When two ice cubes are pressed together, they join to form one cube. Which one of the following helps to hold them together?

Vander waals forces
Dipole interaction
Covalent attraction
Hydrogen bond formation

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Physics
What is another name for energy of motion?

Rotational energy
Motional energy
Potential energy
Kinetic energy

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Physics
A wire of copper having length I and area of cross-section A is taken and a current i is flown through it. The power dissipated in the wire is P. If we take an aluminium wire having same dimensions and pass the same current through it, the power dissipated will be

> P
P
< P
2P

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Physics
The strength of an electromagnet can be increased by

Increasing current supply
Increasing the number of turns
All of these
Increasing the length of the coiled wire

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Physics
Mud houses are cooler in summers and warmer in winters as compared to brick houses because

Mud is a bad conductor
Mud is a good conductor
Mud is a poor insulator
Evaporation of water causes cooling in summers and sunlight coming through holes causes warming in winters

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