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In a neuron, conversion of electrical signal to a chemical signal occurs at/in
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Which of the following statements about transmission of nerve impulse is incorrect?
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What is the correct direction of flow of electrical impulses?
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Label the parts of a neuron in the given figure.
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Explain the function of the neuron.
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Why is the flow of signals in a synapse from axonal end of one neuron to dendritic end of another neuron but not the reverse?
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Which of the following can make a parallel beam of light when light from a point source is incident on it?
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Figure shows a ray of light as it travels from medium A to medium B. Refractive index of the medium B relative to medium A is
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A light ray enters from medium A to medium B as shown in Figure 10.2. The refractive index of medium B relative to A will be
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Beams of light are incident through the holes A and B and emerge out of box through the holes C and D respectively as shown in the Figure Which of the following could be inside the box?
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A beam of light is incident through the holes on side A and emerges out of the holes on the other face of the box as shown in the Figure. Which of the following could be inside the box?
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Why does a light ray incident on a rectangular glass slab immersed in any medium emerges parallel to itself? Explain using a diagram.
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A magnetic compass needle is placed in the plane of paper near point A as shown in Figure. In which plane should a straight current carrying conductor be placed so that it passes through A and there is no change in the deflection of the compass? Under what condition is the deflection maximum and why?
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AB is a current carrying conductor in the plane of the paper as shown in Figure. What are the directions of magnetic fields produced by it at points P and Q? Given r1 > r2, where will the strength of the magnetic field be larger?
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It is established that an electric current through a metallic conductor produces a magnetic field around it. Is there a similar magnetic field produced around a thin beam of moving
- alpha particles,
- neutrons? Justify your answer.
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With the help of a labelled circuit diagram illustrate the pattern of field lines of the magnetic field around a current carrying straight long conducting wire. How is the right hand thumb rule useful to find direction of magnetic field associated with a current carrying conductor?
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In a food chain, the third trophic level is always occupied by
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In the given food chain, suppose the amount of energy at the fourth trophic level is 5 kJ, what will be the energy available at the producer level?
Grass → Grasshopper → Frog → Snake → Hawk
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Accumulation of non-biodegradable pesticides in the food chain in increasing amount at each higher trophic level is known as
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Which group of organisms are not constituents of a food chain?
- Grass, lion, rabbit, wolf
- Plankton, man, fish, grasshopper
- Wolf, grass, snake, tiger
- Frog, snake, eagle, grass, grasshopper
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