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Physics

Physics
What type of lens is a magnifying glass?

Converging
Spherical
Achromatic
Diverging

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Physics
What apparatus is used to locate a submerged object?

Sonar
Pulsar
Quasar
Radar

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Physics
The focal length of a concave mirror with a radius of curvature of 20.0 cm is :

15 cm
20 cm
5 cm
10 cm

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

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Physics
According to the quantum theory of light, the energy of light is carried in discrete units are called

Electrons
Photoelectrons
Protons
Photons

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Physics
To open a door easily, the handle should be fixed

In the middle
Away from mid-point opposite to hinges
None of these
Near the hinges

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