A dip needle vibrates in a vertical plane perpendicular to magnetic meridian. The time of vibration is found to be 25, the same needle is then allowed to vibrate in the horizontal plane and the […]
The number of acidic protons in H₃PO₃ are
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(a) 0 (b) 1 (c) 2 (d) 3
Correct Answer:
2
Explanation:
No explanation available. Be the first to write the explanation for this […]
Equal charge q each are placed at the vertices AQ and B of an equilateral triangle ABC of side a. The magnitude of electric intensity at the point C is
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(a) q/4πε₀a² […]
Two bulbs when connected in parallel to a source take 60W each, the power consumed, when they are connected in series with the same source is
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(a) 15W (b) 30W (c) 60W […]
To draw the maximum current from a combination of cells, how should be the cells be grouped?
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(a) Parallel (b) Series (c) Depends upon the relative values of internal and external resistance […]
When a current of (2.5±0.5) A flows through a wire, it develops a potential difference of (20±1) V, then the resistance of wire is
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(a) (8±2)Ω (b) (8±1.6)Ω (c) (8±1.5)Ω (d) (8±3)Ω
A thin equiconvex lens of refractive index 3/2 and radius of curvature 30 cm is put in water (refractive index = 4/3) , its focal length is
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(a) 0.15 m (b) 0.30 […]
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