Which of the following are found in extreme saline conditions?

(1) Archaebacteria

(2) Eubacteria

(3) Cyanobacteria

(4) Mycobacteria

Subtopic:  Kingdom Monera: Bacterial Classification |
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A spring of force constant k is cut into lengths of ratio 1:2:3. They are connected in series and the new force constant is k'. Then they are connected in parallel and force constant is k’’. Then k’: k’’ is:

1. 1:9

2. 1:11

3. 1:14

4. 1:6

Subtopic:  Combination of Springs |
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The ratio of resolving powers of an optical microscope for two wavelengths λ1=4000 A0 and λ2=6000 A0 is:

1. 9:4

2. 3:2

3. 16:81

4. 8:27

Subtopic:  Resolving Power of Optical Devices |
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The two nearest harmonics of a tube closed at one end and open at the other end are 220 Hz and 260 Hz. What is the fundamental frequency of the system?

1. 20 Hz

2. 30 Hz

3. 40 Hz

4. 10 Hz

Subtopic:  Standing Waves |
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Consider a drop of rainwater having a mass of 1gm falling from a height of 1 km. It hits the ground with a speed of 50 m/s. Take 'g' constant with a value 10 m/s2. The work done by the
(i) gravitational force and the
(ii) resistive force of air is:

1. (i) 1.25 J (ii) -8.25 J

2. (i) 100 J (ii) 8.75 J

3. (i) 10 J (ii) -8.75 J

4. (i) -10 J (ii) -8.75 J

Subtopic:  Work Energy Theorem |
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A physical quantity of the dimensions of length that can be formed out of c, G and e24πεois [c is the velocity of light, G is the universal constant of gravitation and e is charge]:

1. c2Ge24πε012

2. 1c2e24Gπε012

3. 1cGe24πε0

4. 1c2Ge24πε012

Subtopic:  Dimensions |
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Two rods A and B of different materials are welded together as shown in the figure. Their thermal conductivities are K1 and K2. The thermal conductivity of the composite rod will be:
          

1. 3(K1+K2)2

2. K1+K2

3. 2(K1+K2)

4. K1+K22

Subtopic:  Conduction |
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A capacitor is charged by a battery. The battery is removed and another identical uncharged capacitor is connected in parallel. The total electrostatic energy of resulting system:-

1. Decreases by a factor of 2

2. Remains the same

3. Increases by a factor of 2

4. Increases by a factor of 4

Subtopic:  Energy stored in Capacitor |
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In a common-emitter transistor amplifier, the audio signal voltage across the collector is 3V. The resistance of the collector is 3kΩ. If the current gain is 100 and the base resistance is 2kΩ, the voltage and power gain of the amplifier are:

1. 15 and 200

2. 150 and 15000

3. 20 and 2000

4. 200 and 1000

Subtopic:  Applications of Transistor |
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Thermodynamic processes are indicated in the following diagram: 
 
Match the following: 

Column-I  Column-II 
P. Process I a. Adiabatic
Q. Process II b. Isobaric
R. Process III c. Isochoric
S. Process IV d. Isothermal
 
P Q R S
1. c a d b
2. c d b a
3. d b a c
4. a c d b
Subtopic:  Types of Processes |
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