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(d) Nervous and Muscular

How many pairs of cranial nerves are present in man ? 
(a) 12 

(d) Nostrils → pharynx → larynx → trachea → alveoli

(d) A reflex arc is the neural pathway that mediates a reflex action. In higher animals, most sensory neurons do not pass directly into the brain, but synapse in the spinal cord. This characteristic allows reflex actions to occur relatively quickly by activating spinal motor neurons without the delay of routing signals through the brain, although the brain will receive sensory input while the reflex action occurs.

(b) Neurons are electrically excitable cells in the nervous system that process and transmit information. In vertebrate animals, neurons are the core components of the brain, spinal cord and peripheral nerves.

(a) Sensory receptor, in physiology, any structure which, on receiving environmental stimuli, produces an informative nerve impulse.

(b) number of processes arising from the cell body 

Which part of a nerve cell contains a nucleus

(c) Cyton 

Nuclear fusion is possible at the star, because it can take place at or above temperature 2 × 10⁷ K. Above 2 × 10⁷ K carbon-nitrogen cycle is more probable, therefore at the star the probability of carbon-nitrogen cycle is greater.

Correct answer is (c) henry

The SI unit of self-inductance (Henry) can also be expressed as Ohm-second.

Like archaebacteria, eubacteria are complex and single celled. Most bacteria are in the EUBACTERIA kingdom. They are the kinds found everywhere and are the ones people are most familiar with. Eubacteria are classified in their own kingdom because their chemical makeup is different.

When a force acts over a large area of an object, it produces a small pressure. But if the same force acts over a large area of an object, it produces a large pressure. The force produced by the man's weight is distributed over hundreds of nails of the nail bed. Therefore, the force applied by individual nail is reduced. As a result the force per unit area at the tip of each nail is less than that required for the nail to pierce into the skin. This implies to all the nails in contact with the man’s body. The nails do not penetrate in the man’s skin and he does not get hurt. Thus, a person can lie on a bed of nails if there are very large number of nails.

As we know that, electric current is nothing but the rate at which charge is transferred per unit time. So, it would be the ratio of total charge transferred to the required time.

electric current i = \(\frac{100\,\text{coulomb}}{50\,\text{sec}}\) = 2 Ampere

SI unit of measuring current= Ampere (A)

Electron , proton & neutron.

Electron charge (q_e)

q_e = e = -1.602 × 10^-19 C

Proton charge (q_p)

q_p = -e = +1.602 × 10^-19 C

Neutron (n)

Neutron is considered as charge less particle.

This occurs with water and a glass tube. A convex meniscus occurs when the molecules have a stronger attraction to each other than to the container, as with mercury and glass.

It is a property of every matter that is responsible for the electrical phenomenon existing in the matter in a positive or negative form.

The unit of charge is coulombs(C).

Answer: False

Area of an equilateral triangle of side a = √3/4 a²

According to the question,

Area of a triangle = 20√3 cm²

⇒ √3/4 a² = 20√3

⇒ a² = 20× 4

⇒ a² = 80

⇒ a = 4√5 cm

The correct statement is(c). 

The voltage gain of a transistor amplifier is constant at mid-frequency range only. It is low at high and low frequencies.

Correct option(c)

Explanation:

As sliding contact C is moved from A to B resistance of circuit remains unchanged, so Reading of ammeter remains constant. As length AC increases, the potential difference across it also increases, as a result reading of voltmeter increases.