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

Dipole interaction
Covalent attraction
Vander waals forces
Hydrogen bond formation

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Physics
RADAR is used for:

locating geostationary satellites.
locating submerged submarines.
receiving a signals in a radio receiver.
detecting and locating the position of objects such as Aeroplanes.

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Physics
In the gamma decay of a nucleus

The mass number of the nucleus changes whereas its atomic number does not change
Neither the mass number nor the atomic number of the nucleus changes
The mass number of the nucleus does not change whereas its atomic number changes
Both the mass number and the atomic number of the nucleus change

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