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Correct option is E) Like all machines, a computer needs to be directed and controlled if it is to perform a task successfully.

correct option is b. Advance plan of all the activities

correct option is a. Expensive

Correct option is A) while later ones had complex patterns covering the entire vessel

correct option is b. Canned

Hint—Tyndall effect can be seen when light passes through a heterogeneous mixture. Example, when sunlight passes through the canopy of a dense forest.

According to Right Hand Thumb Rule of James Clark Maxwell holding a current carrying conductor with the right hand in such a way, that the thumb points in the direction of the current. The direction in which the other fingers encircle the conductor gives the direction of the magnetic field.

No magnetic field lines inside the coil seen in the same direction

a. Only B1 because electricity flows only through B1

b. B1 and B2 because of mutual induction.

c. Light of B1 will be reduced when AC is passed through it. This is due to the back emf produced due to self-induction.

d. Transformer, Relay switch.

Direction of magnetic lines reversed.

The core material of transformer must have : 

i. High permeability 

ii. Low hysteresis loss

Out from the coil

Magnetic fields marked- Into the coil

No, AB moves forward and CD moves back wards.

1. Forces produced are in the opposite directions. They are experiences on the different positions of same object. So it rotates.

1. In the magnetic field.

2. It is connected with the voice coil.

3. Current reaches from the amplifier.

4. It vibrates.

c. The electrical pulses from a microphone.

e. Electrical pulses are strengthened using an amplifier

a. strengthened electrical pulses are sent through the voice coil of a loudspeaker

b. The voice coil, which is placed in the magnetic field, moves to and fro rapidly, in accordance with the electrical pulses.

d. Make the diaphragm vibrate, thereby reproducing sound

a. Towards east 

b. Ampere’s swimming rule

c. Ampere’s swimming rule Suppose a man swims in the direction j of current flow in a conductor by looking towards a magnetic needle, the north pole deflects towards the direction of the left hand.

d. A freely suspended magnetic needle remains in the north south direction. When the current flows in the east west direction, the magnetic field produced will be in the north south direction. Magnetic needle does not deflect.

When current flows through the solenoid, it behaves like a bar magnet.

1. When a solenoid is hold in the right hand and if the four fingers represent the direction of current flow, then the thumb represents the direction of the North pole.

2. The end of the solenoid through which current flows in the clock wise direction is the south pole and the end through which current flows in the anti clockwise direction is north pole.

a. 

A – South pole 

B – North pole

b.

1. Increase the number of turns

2. Increase the strength of current flow.

3. Use soft iron as the core.

4. Increase the area of cross section of the solenoid.

If the North end of the compass needle is j pointing toward your magnet, if it attract you have found the South pole of your j magnet. Rotate the other side of your magnet toward the compass; the South end of the compass needle will now be pointing directly to the North pole of your magnet.

a. From B to A

b. The magnetic field across the conductor AB can be formed out. The direction of the magnetic field will be below the table, The rule which helps to find out this is the right hand thumb rule.

According to Right Hand Thumb Rule of James Clark Maxwell holding a current carrying conductor with the right hand in such a way, that the thumb points in the direction of the current, I The direction in which the other fingers j encircle the conductor gives the direction of the magnetic field.

c. The direction of current flow in the coil will 1 be from B to A. That is when viewed from top in the clockwise direction so the direction of magnetic field lines will be from outside to inside the coil.

Cheque is a bill of exchange drawn on a specified banker and not expressed to be Payable otherwise than on demand.

Telecom billing is a process of collecting usage, aggregating it, applying required usage and rental charges and finally generating invoices for the customer’s .It is also a process which includes receiving and recording payments from the customers.

A career is a line of work that a person takes for life. 

There are two ways a person can earn a living.

a) Self employment 

b) Wage employment

Ex: A doctor who works for a hospital is a wage employed person, where as if the same doctor has its own clinic, he /she is a self-employed person.

If the direction of current flow in the end of the solenoid is in the clock wise direction. South pole is formed there . If the direction of current flow is in the anti clockwise direction, the pole formed there is North. methods to increase the magnetic strength of solenoid.

• Increase the number of turns 
• Increase the intensity of current.
• Increase the area of cross section of the soft iron which is used as the core.

Children who have gone to school will be able to do jobs so that they can take care of themselves and their families. And also helps to become aware of one’s role as a responsible citizen.

Education helps us become aware of our role as a responsible citizen. We should 

1. Use the facilities present in our areas. 

2. Take our friends to school.

Correct answer is: b. It will be the same at all points

A commutator is a rotary electrical switch in certain types of electric motors and electrical generators that periodically reverses the current direction between the rotor and the external circuit.

1. It will ensure that resources like air, water, forests are saved to future generation. 

2. Problems like Climate Change, Emission of Green House gases can be taken care of with the help of Sustainable Development. 

3. Adoption of Sustainable Development in our daily life and at our work place will also promote economic growth.

The magnetic intensity will decrease. The magnetic intensity decreases as the number of magnetic lines decreases through as area of 1 unit.

When the coil is kept in south north direction the magnetic field becomes free. That is when kept in south north direction the geomagnetic does not influence the experiment.

Slip ring : AC Generator

Split ring commutator : DC Generator

A spinning neutron star is known as Pulsar.

To charge a battery, the current should be unidirectional. Therefore, a commutator is fitted to reverse the connections of the external circuit to the generator in order to make the current unidirectional in that circuit.

In the motor the split rings rotate, according to the armature rotation. When the position of the semiconductor rings in the split ring changes the direction of the current in the armature also change. In this way the continuous rotation of the DC motor is possible.

Given equation y(x, t) = 8 sin(0.02x - 4t) cm

comparing this y(x, t) = A sin(kx - ωt + ϕ) equation.

then

A = 8,  k = 0.02, ω = 4

\(\lambda=\frac{2\pi}k\) 

\(\lambda=\frac{2\pi\times100}2\)

\(\lambda=100\pi\,cm\) 

f = \(\frac{\omega}{2\pi}\) 

f = \(\frac{4}{2\pi}\) 

f = \(\frac2{\pi}\) Hz

speed of wave v = \(\lambda f\)

 = 100 π x \(\frac2{\pi}\) 

v = 200 cm/s

(a) generator.
An A.C. generator is the device used for producing an electric current.
Hence, the option (a) is correct.

Sun is the ultimate source of energy. Justify by explaining the direct or indirect dependence of different sources of energy on Sun.

Correct answer is (d) Helium

('He' is monoatomic and has low atomic mass)- It belongs to Nobel gases group(group-18) and they have very least inter-atomic attraction due to which their boiling points are very low.

Answer is (d) Helium

(He is monoatomic and has low atomic mass)

In case of phenolphathalin indicator - only

Na₂CO₃ react with H₂SO₄ → 2NaHCO₃ + Na₂SO₄

So number of M moles of Na₂CO₃ = Number of M moles of  H⁺ ions

 = 2 x (0.2 x 4ml)

⇒ 1.6 M mole 

In case of method orange - both NaHCO₃ and Na₂Ca₃ will react.

2NaHCO₃ + H₂SO₄ → Na₂SO₄ + H₂O + CO₂--- (i)

Na₂CO₃ + H₂SO₄ → Na₂SO₄ + H₂O + CO_2----(ii)

Total M mole of H⁺_ion = 2(12ml x 0.2 M)

 = 2(2.4 M mole)

 = 4.8 M mole

from eqn ---(ii)

\(\because\) 1 mole of Na₂CO₃ required to neutralize = 2 mole of H⁺_ions

\(\therefore\) 1.6 M mole Na₂CO₃ required to neutralize = 3.2 M mole of H⁺_ions

from eqn---(i) we can see that-----

1 mole of NaHCO₃ required to neutralize = 1 mole of H⁺_ions

So, Number of M moles of NaHCO₃ = (4.8 - 3.2) = 1.6 M mole

Therefore the ration of M mole of NaHCO₃ to Na₂CO₃

⇒ 1.6/1.6 = 1 : 1

The correct answer is Clipboard.

• Clipboard stores the cut or copied texts in MS Word.

• The Office Clipboard stores text and graphics that you copy or cut from anywhere, and it lets you paste the stored items into any other Office file.
• A header is the top margin of each page.
• A footer is the bottom margin of each page.

The increase in demand for energy affects our environment adversely due to the increase pollutants like CO, SO₄ etc. are released into the atmosphere which lead to greenhouse affect.

Correct option is (c) Lr

Lawrenium (Lr) has electronic configuration [Rn]5f¹⁴7s²7p¹

Correct option is (D) Unniltrium

Atomic Number 103