Question
Is it possible for a concave lens to form an image twice the size of the object
(a) Is it possible for a concave lens to form an image of size two times that of the object? Write Yes…
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Class: Class 10
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Question
A geyser is rated 240 W – 220 V
‘A geyser is rated 240 W – 220 V’. Explain the meaning of this statement.
Question
A metal foot ruler is held at the edge of a table
A metal foot ruler is held at the edge of a table. It is pressed at its free end and then released.…
Question
Calculate the power spent by a crane while lifting a load
Calculate the power spent by a crane while lifting a load of mass 2000 kg, at velocity of 1.5 m s−1. (g…
Question
What should be the angle between force and displacement for work to be negative
(a) What should be the angle between the direction of force and the direction of displacement, for work to be negative? (b)…
Question
The diagram shows wheel O pivoted at point A
The diagram shows wheel O pivoted at point A. Three equal forces F1, F2 and F3 act at point B on the…
Question
What is the position of centre of gravity of a triangular lamina
(a) What is the position of centre of gravity of a triangular lamina? (b) When this triangular lamina is suspended freely from…
Question
When does the nucleus of an atom tend to become radioactive
(a) When does the nucleus of an atom tend to become radioactive? (b) Name a single pulley in which displacement of load…
Question
Small air bubbles rising up a fish tank appear silvery
Small air bubbles rising up a fish tank appear silvery when viewed from some particular angle is due to the: (a) reflection…
Question
When a ray of light travels normal to the given surface
When a ray of light travels normal to the given surface, then the angle of refraction is: (a) 180° (b) 90° (c)…