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Aluminium (Al).

(c) A is true, R is false

Hormone secreted by thyroid gland is thyroxine

As the curved path is confined to the XY plane,  the component of magnetic field effective in  deflecting the particle is the Z-component only.  The other component should be the X-component since the X-component cannot deflect the charged particle proceeding along the X-direction. There has to be an electric field since the path of the particle is non-circular. All these conditions are satisfied by option (b).

Correct Answer is: (c) 2/3

The magnetic field strength at M due to QR is zero in all cases.

When QS carries I/2 current, the field strength at M due to QS is H₁/2. Then

H₂ = H₁ + H₁/2 = 3H₁/2

or H₁/H₂ = 2/3.

The correct option (2) 320m/s, 80Hz   

Explanation:

f₃ = 3V/2L = 240

(3 x V)/(2 x 2) = 240

V = 320m/s

 f₀ = V/2L = 320/(2 x 2) = 80Hz

Correct Answer: C  

Explanation : Magnetic field at any point lying on the current carrying straight conductor is zero. 

Here H1 = Magnetic field at M due to current in PQ.         

H2 = Magnetic field at M due to QR + magnetic field at M due to QS + magnetic field at M due to PQ =0+H₁/2+H₁= 3/2 H₁ 

H₁/H₂ = 2/3

Correct Answer: C) All ions deflect towards -y direction

Exaplanation :

As the electric field is switched on, positive ion will start to move along positive x-direction and negative ion along negative x-direction. Current associated with motion of both types of ions is along positive x-direction. According to Fleming's left hand rule force on both types of ions will be along negative y-direction.

Magnetic field inside the cylinder is λμ•

Explanation:

As there is given that current is flowing along its circumference. 

So we already know that inside the cylinder the magnetic field will be μ•/4π (2I'/r'), where I' is the current flowing and r' is the distance from the centre.

λ is the current per unit length so, λ = I/2πr ⇒ I = λ2πr 

Current inside the cylinder at r' distance from the centre is I' = λ2πr'

Now we put the value in the equation.
B_(inside) = μ•/4π (2I'/r') = μ•/4π (2 x λ x 2πr'/r') = λμ•

Correct option: (3)

Explanation:

(i) No. of e^– doesn't depend on v

(ii) KE of e^– doesn't depend on light intensity 

(iii) hv = W + KE 

(iv) E = W + KE

Panchayati Raj was introduced in the country in 1959

Panchayati Raj was first introduced in Rajasthan

Correct option: (1) 20 mA

Explanation:

According to color code

R = 50 × 10² ohm

i²R = 2 watt

i = 20 mA

(c) A retired Judge of the Supreme Court of India

Correct option: (1) 500Ω

Explanation:

Significant figure of red band is 2

and for green is 5

So new resistance 500 Ω

Since ice is in gravity free space, thus after melting it forms a sphere. Area of ice cube= area of sphere1 cm³ 

=4/3πr³

=> r=(3/4π)^1/3

Now, surfacr area is given byS.A.= 4πr² 

=4π(3/4π)^2/3 

=(9π)^1/3

The correct answer is 52 seconds. 

• Our National Anthem is Jana Gana Mana, it approximately takes 52 seconds for the full version.
• It was composed originally in Bengali by Rabindranath Tagore.
• It was adopted in its Hindi version by the Constituent Assembly as the National Anthem of our country on 24 January 1950.

• It was sung for the first time in the Calcutta Session of the Indian National Congress on 27 December 1911.
• It comprises of 5 Stanzas.

• Devices work according to the marked power.
• Devices can be controlled using switches as per need.
• The bulbs will get the required voltage.

Average usage = \(\cfrac{Total\,usage}{no.\,of\,days}\)

Methods to reduce the usage of electricity.

• Use devices of good efficiency.
• Use electricity only when required.
• Reduce cooking using electricity.
• Reduce the use of air conditioners and refrigerators.

4 hour’s consumption of 5 CFL having 20 W.

\(\cfrac{5 \times 20\, \times\, 4}{1000}= 0.4\) kWh

5 hour’s consumption of 4 Fan having 60 W

\(\cfrac{4 \times 60\, \times\, 5}{1000}= 1.2\) kWh

4 hour’s consumption of one T.V having 100 W

\(\cfrac{1 \times 100\, \times\, 4}{1000}= 0.4\) kWh

Total unit = 2 kWh

1. Over loading or Short circuit.

2. More heat is generated. So appliances and circuit will get damaged.

3. The current in the circuit may increase due to reasons such as short circuit, overload, excess flow of current or any problems in the insulation. As the higher temperature produced in the circuit due to these reasons makes the fuse wire to melt and the flow of current stops. Thus the circuit and the appliances are protected.

Ordinary fuse works making use of heating effect of electricity while MCB works making use of heating and magnetic effects of electricity. The current in the circuit may increase due to reasons such as short circuit, overload, excess flow of current or any problems in the insulation.

As the higher temperature produced in the circuit due to these reasons makes the fuse wire to melt and the flow of current stops. Thus the circuit and the appliances are protected. MCB automatically breaks the circuit whenever there is an excess flow of current due to short circuit or overloading. After rectifying the circuit we can switch on the MCB and make the circuit as it was.

Two equal and opposite charges separated by a small distance constitute an electric dipole.

(d) Steel and aluminium

The electric dipole moment vector lies along the line joining two charges and is directed from  – q to +q. The SI unit of dipole moment is coulomb meter (cm).

\(\vec p\) = qa\(\hat i\) - qa(-\(\hat i\)) = 2qa \(\hat i\)

(c) Engelberger