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Physics

Physics
Who among the following discovered X-rays?

James Chadwick
Marie Curie
W.C Roentgen
J.J Thomson

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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?

Dipole interaction
Hydrogen bond formation
Vander waals forces
Covalent attraction

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Physics
Universal gates are

AND and XOR
NAND and NOR
AND and OR
OR and NOT

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Physics
A parallel-plate capacitor of capacitance C1 is made using two gold plates. Another parallel-plate capacitor of capacitance C2 is made using two aluminium plates with same plate separation, and all the four plates are of same area. If rg and ra are respectively the electrical resistivities of gold and aluminium, then which one of the following relations is correct?

C1>C2
C1 = C2
C1pa = C2pg
C2>C1

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Physics
Rain is falling vertically downwards. To a man running east-wards, the rain will appear to be coming from

east
northeast
west
southeast

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Physics
A gap is left between two rails of a railway track to accommodate...... of the metal.

Apparent expansion
Linear expansion
Areal expansion
Volume expansion

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