English Medium कक्षा १० - CBSE Question Bank Solutions for Science

Assertion: Sky appears blue in the day time.

Reason: White light is composed of seven colours.

What happens at the synapse between two neurons?

The gap between two neurons is called a ______.

What is the function of receptors in our body?

Which signals will get disrupted in case of a spinal cord injury?

What is the need for a system of control and coordination in an organism?

Compare and contrast nervous and hormonal mechanisms for control and coordination in animals.

Judge the equivalent resistance when the following are connected in parallel − (a) 1 Ω and 10⁶Ω, (b) 1 Ω and 10³Ω and 10⁶Ω.

A piece of wire of resistance R is cut into five equal parts. These parts are then connected in parallel. If the equivalent resistance of this combination is R’, then the ratio `"R"/"R'"` is ______.

A battery of 9 V is connected in series with resistors of 0.2 Ω, 0.3 Ω, 0.4 Ω, 0.5 Ω and 12 Ω, respectively. How much current would flow through the 12 Ω resistor?

Why is the series arrangement not used for domestic circuits?

Draw the structure of a neuron.

Write a and b in the given flow chart of the neuron through which information travels as an electrical impulse.

The pH of a salt used to make tasty and crispy pakoras is 14. Identify the salt and write a chemical equation for its formation. List its two uses.

An electrical appliance has a resistance of 25 Ω. When this electrical appliance is connected to a 230 V supply line, the current passing through it will be:

(a) 0.92 A
(b) 2.9 A
(c) 9.2 A
(d) 92 A

When a 4 Ω resistor is connected across the terminals of a 12 V battery, the number of coulombs passing through the resistor per second is:

(a) 0.3
(b) 3
(c) 4
(d) 12

The substance having infinitely high electrical resistance is called:

(a) conductor
(b) resistor
(c) superconductor
(d) insulator

If the length of a wire is doubled by taking more of wire, what happens to its resistance?