Which of the following are found in extreme saline conditions?

1. Archaebacteria

2. Eubacteria

3. Cyanobacteria

4. Mycobacteria

Subtopic:  Kingdom Monera: Bacterial Classification |
 91%
From NCERT
NEET - 2017
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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 |
 69%
From NCERT
NEET - 2017
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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 (OLD NCERT) |
 76%
From NCERT
NEET - 2017
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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 |
From NCERT
NEET - 2017
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Consider a drop of rainwater having a mass of \(1~\text{gm}\) falling from a height of \(1~\text{km}\). It hits the ground with a speed of \(50~\text{m/s}\). Take \(g\)  as constant with a value \(10~\text{m/s}^2.\) The work done by the
(i) gravitational force and the
(ii) resistive force of air is:

1. \((\text{i})~1.25~\text{J};\) \((\text{ii})~-8.25~\text{J}\)
2. \((\text{i})~100~\text{J};\) \((\text{ii})~8.75~\text{J}\)
3. \((\text{i})~10~\text{J};\) \((\text{ii})~-8.75~\text{J}\)
4. \((\text{i})~-10~\text{J};\) \((\text{ii})~-8.75~\text{J}\)

Subtopic:  Work Energy Theorem |
 68%
From NCERT
NEET - 2017
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A physical quantity of the dimensions of length that can be formed out of \(c, G,~\text{and}~\frac{e^2}{4\pi\varepsilon_0}\)is [\(c\) is the velocity of light, \(G\) is the universal constant of gravitation and \(e\) is charge]:
\(1. ~c^2\left[G \frac{e^2}{4 \pi \varepsilon_0}\right]^{\frac{1}{2}}\\ 2.~ \frac{1}{c^2}\left[\frac{e^2}{4 G \pi \varepsilon_0}\right]^{\frac{1}{2}}\\ 3. ~\frac{1}{c} G \frac{e^2}{4 \pi \varepsilon_0}\\ 4. ~\frac{1}{c^2}\left[G \frac{e^2}{4 \pi \varepsilon_0}\right]^{\frac{1}{2}}\)

Subtopic:  Dimensions |
 54%
From NCERT
NEET - 2017
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Two rods \(A\) and \(B\) of different materials are welded together as shown in the figure. Their thermal conductivities are \(K_1\) and \(K_2.\) The thermal conductivity of the composite rod will be:
            
1. \(\frac{3(K_1+K_2)}{2}\)
2. \(K_1+K_2\)
3. \(2(K_1+K_2)\)
4. \(\frac{(K_1+K_2)}{2}\)

Subtopic:  Conduction |
 71%
From NCERT
NEET - 2017
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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 the 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 |
 57%
From NCERT
NEET - 2017
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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 (OLD NCERT) |
 70%
From NCERT
NEET - 2017
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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 |
 77%
From NCERT
NEET - 2017
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