Multiple Choice Question About Current Magnetic Field

1.According to Curie’s law, the magnetic susceptibility of a substance at an absolute

temperature T is proportional to?

(a) T2

(b) 1/T

(c) T

(d) 1/T2

Ans:b

2.Two magnets of magnetic moments M and 2M are placed in a vibration magnetometer, with the identical poles in the same direction. The time period of vibration is T1. If the magnets are placed with opposite poles together and vibrate with time period T2 then ?

(a) T2 is infinite

(b) T2=T1

(c)T2>T1

(d) T2 is less than T1

Ans:c

3.If a diamagnetic substance is brought near north or south pole of a bar magnet, it is?

(a) attracted by the poles

(b) repelled by the poles

(c) repelled by north pole and attracted by the south pole

(d) attracted by the north pole and repelled by the south pole

Ans:b

4.The work done in turning a magnet of magnetic moment M by an angle of 90° from the meridian, is n times the corresponding work done to turn it through an angle of 60°.

The value of n is given by

(a)2

(b) 1

(c) 0.5

(d) 0.25

Ans:a

5.A galvanometer can be converted into a voltmeter by connecting?

(a) A high resistance in parallel

(b) A low resistance in series

(c) A high resistance in series

(d) A low resistance in parallel

Ans:c

6.A proton moving with a velocity 3 x 105 m/s enters a magnetic field of 0.3 Tesla at an angle of 30° with the field. The radius of curvature of its path will be (e/m for proton – 108 C/kg)

(a)2cm

(b) 0.5 cm

(c)0.02 cm

(d) 1.25 cm

Ans:b

7.A charged particle moves through a magnetic field in a direction perpendicular to it. Then the

(a) velocity remains unchanged

(b) speed of the particle remains unchanged

(c) direction of the particle remains unchanged

(d) acceleration remains unchanged

Ans:b

8.When a proton is accelerated through I V, then its kinetic energy will be?

(a)1840 eV

(b) 13.6eV

(c)1 eV

(d) 0.54eV

Ans:c

9.A coil of one turn is made of a wire of certain length and then from the same length a coil of two turns is made. If the same current is passed in both the cases, then the ratio of the magnetic inductions at their centres will be?

(a)2:1

(b)1:4

(c)4:1

(d)1:2

Ans:b

10.Two long parallel wires are at a distance of 1 metre. Both of them carry one ampere of current The force of attraction per unit length between the two wires is?

(a)2 x10-7 N/m

(b) 2 x10-8 N/m

(c) 5×10-8 N/m

(d)10-7 N/m

Ans:a

11.A long solenoid carrying a current produces a magnetic field B along its axis. If the current is doubled and the number of turns per cm is halved, the new value of the magnetic field is ?

(a) 4B

(b) B/2

(c) B

(d) 2B

Ans:c

12.At what distance from a long straight wire carrying a current of 12 A will the magnetic field

be equal to 3×10-6 Wb/metre Square

(a) 8×10-2 m

(b) 12×10-2 m

(c)18x 10-2 m

(d) 24×10-2 m

Ans:a

13.A electron enters a region where magnetic (B) and electric (E) fields are mutually

perpendicular, then ?

(a) it will always move in the direction of B

(b) it will always move in the direction of E

(c) it always possesses circular motion

(d) it can go un deflected also.

Ans:d

14.A coil carrying electric current is placed in uniform magnetic field

(a) torque is formed

(B) e.m.f is induced

(c) both (a) and (b) are correct

(d) none of the above

Ans:a

15.A straight wire of length 0.5 metre and carrying a current of 1.2 ampere is placed in uniform magnetic field of induction 2 Tesla. The magnetic field is perpendicular to the length of the wire. The force on the wire is ?

(a) 2.4N

(b) 1.2N

(c) 3.0 N

(d) 2.0 N

Ans:b

Combined Defence Services ( CDS) Solved 2005 Paper

1.Philip Kotler is well-known as a

(a) Film actor

(b) Swimmer

(c) Management expert

(d) Fashion designer

Ans: c

2.In Indian history, which one of the following wars occurred earliest ?

(a) First Anglo-Afghan war

(b) Second Carnatic war

(c) Third Anglo-Maratha war

(d) Fourth Anglo Mysore war

Ans: b

3.Why did Dutch East India Company fail to maintain its influence in India ?

(a) Portuguese did not allow them to trade in India

(b) There was a growing interference of Dutch Government in the company’s internal affairs

(c) Dutch indulged in forcible religious conversion of the people and thus were expelled by local kings

(d) The English forces made them to leave India

Ans: d

4.Who granted the permission to establish the first British

factory at Hooghli in Bengal ?

(a) Shah Shuja

(b) Murshid Quli Khan

(c) Shuja-ud-din

(d) Alivardi Khan

Ans: a

5.Who among the following ladies has/have been Governor(s)

of a State/States ?

1. Rajinder Kaur Bhattal

2. Shailja Chandra

3. Justice Fatima Beevi

Select the correct answer using the codes given below :

(a) 1 and 2

(b) 2 and 3

(c) 3 only

(d) 1, 2 and 3

Ans: c

6.Nivi, Paridhan and Adhivasa were the

(a) Different types of garments of the Aryans

(b) Government officials of the Aryan kings

(c) Tribal people of Ancient India

(d) Musical instruments of ancient Indians

Ans: a

7.Consider the following statements :

1. Glycerol is used in explosives.

2. Detergents are made from hydrocarbons obtained from cool or petroleum

3. Sodium perborate is a mild bleaching agent.

4. Methanol is used for making synthetic fibres.

Which of the statements given above are correct ?

(a) 1, 2, 3 and 4

(b) 1, 2 and 3

(c) 2, 3 and 4

(d) 1 and 4

Ans: b

8.What is the maximum strength of Lik Sabha as stated in the Constitution of India ?

(a) 545

(b) 548

(c) 552

(d) 555

Ans: c

9.In India, which one of the following has the lowest

density of population as per Census 2001 ?

(a) Andaman and Nicobar Islands

(b) Arunachal Pradesh

(c) Mizoram

(d) Sikkim

Ans: b

10.Who among the following is not a dancer ?

(a) Geeta Chandran

(b) Mamta Shankar

(c) Kishori Amonkar

(d) Swapnasundari

Ans: c

11.Consider the following statements :

1. Foehn is a very cold and dry wind with a high velocity

and brings down the temperature below freezing point.

2. Mistral is a strong, gusty, dry and warm wind which

develops on the leeward side of a mountain range.

Which of the statements given above is/are correct ?

(a) 1 only

(b) 2 only

(c) Both 1 and 2

(d) Neither 1 nor 2

Ans: ( d

12.Who among the following received the prestigious Borlaug Award for generating awareness among farmers about threats to food security and livelihoods from patents and intellectual property rights ?

(a) Aruna Roy

(b) Champa Devi

(c) Suman Sahai

(d) Vandana Shiva

Ans: c

13.Consider the following statements :

1. Mauritius island is of volcanic origin.

2. Maldives are coral islands.

3. Reunion islands are mountain peaks projected out of water.

Which of the statements given above are correct ?

(a) 1 and 2

(b) 2 and 3

(c) 1 and 3

(d) 1, 2 and 3

Ans: d

14.What is the name of second stealth warship launched by

India ?

(a) Aravalli

(b) Nilgiri

(c) Satpura

(d) Vindhya

Ans: c

15.Consider the following statements :

1. When two water droplets merge with each other to form a

large droplet, energy is liberated.

2. The excess pressure inside a soap bubble is directly

proportional to its surface tension.

3. When a drop of waterbreaks into two droplets of equal size, the sum of the surface areas of the two droplets is equal to that of the original drop.

Which of the statements given above are correct ?

(a) 1 and 2

(b) 1 and 3

(c) 2 and 3

(d) 1, 2 and 3

Ans: a