English Medium Class 10 - CBSE Question Bank Solutions for Science

Which of the following statements are true?

1. Sudden action in response to something in the environment is called reflex action
2.  Sensory neurons carry signals from spinal cord to muscles
3. Motor neurons carry signals from receptors to spinal cord
4. The path through which signals are transmitted from a receptor to a muscle or a gland is called reflex arc

Junction between two neurons is called

Which of the following ray diagrams is correct for the ray of light incident on a concave mirror as shown in Figure?

Fig. A	Fig. B	Fig. C	Fig. D

Draw ray diagrams showing the image formation by a concave mirror when an object is placed

1.  between pole and focus of the mirror
2. between focus and centre of curvature of the mirror
3. at centre of curvature of the mirror
4. a little beyond centre of curvature of the mirror
5. at infinity

How will you infer with the help of an experiment that the same current flows through every part of the circuit containing three resistances in series connected to a battery?

Meena draws magnetic field lines of field close to the axis of a current carrying circular loop. As she moves away from the centre of the circular loop she observes that the lines keep on diverging.
How will you explain her observation.

Plastic insulation surrounds a wire having diameter d and length l as shown above. A decrease in the resistance of the wire would be produced by an increase in the ______.

Rohit wants to have an erect image of an object using a converging mirror of focal length 40 cm.

1. Specify the range of distance where the object can be placed in front of the mirror. Justify.
2. Draw a ray diagram to show image formation in this case.
3. State one use of the mirror based on the above kind of image formation.

The resistance of a wire of 0.01 cm radius is 10 Ω. If the resistivity of the wire is 50 × 10^-8 Ω, find the length of this wire.

Consider the following chemical equation I and II

1. \[\ce{Mg + 2HCl -> MgCl_2 +H_2}\]
2. \[\ce{NaOH +HCl -> NaCl + H_2O}\]

The correct statement about these equations is:

In the given diagram:

1. Name the parts labelled A, B, and C.
2. Write the functions of A and C.
3. Reflex arcs have evolved in animals? Why?

How will the resistance of a wire be affected if its

1. length is doubled, and
2. radius is also doubled ?

Give justification for your answer.

State the change in colour observed in following case mentioning the reason:

A piece of zinc is dipped in ferrous sulphate solution.

The correct pattern of magnetic field lines of the field produced by a current carrying circular loop is:

Sensory nerve of a reflex arc carries information from the receptor cells to the ______.