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)…
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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)…
Question
Specific heat capacity of a substance X is 1900 J kg⁻¹ °C⁻¹ means
Specific heat capacity of a substance X is 1900 J kg−1 °C−1 means: (a) Substance X absorbs 1900 J for 1°C rise…
Question
Specific latent heat of a substance
Specific latent heat of a substance: (a) is directly proportional to the mass (b) is directly proportional to the change in the…
Question
If the strength of the current flowing through a wire is increased
If the strength of the current flowing through a wire is increased, the strength of the magnetic field produced by it: (a)…
Question
Choose the correct relation for e.m.f. and terminal voltage V
Choose the correct relation for e.m.f. (ε) and terminal voltage V: (a) ε = V [always] (b) V > ε [always] (c)…