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Assertion (A): A photovoltaic cell is greatly affected by temperature. Reason (R): Both germanium and silicon can be used for photovoltaic cells. | |
A. | Both A and R are true and R is correct explanation of A [Wrong Answer] |
B. | Both A and R are true but R is not correct explanation of A [Correct Answer] |
C. | A is true R is false [Wrong Answer] |
D. | A is false R is true [Wrong Answer] |
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Explanation:-
Answer : B Discuss it below : !! OOPS Login [Click here] is required to post your answer/result |
Also Read Similar Questions Below :
⇒ The electrical energy required to heat a bucket of water to a certain temperature is 2 kWh. If heat losses, are 25%, the energy input is
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⇒ The antenna current of an AM transmitter is 8 A. When only the carrier is sent, but it increases to 8.93 A. when the carrier is sinusoidally modulated. The percentage modulation is nearly
0.9
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0.7
⇒ Which one of the following statements is not a property of RL driving point impedance?
The first critical frequency at the origin is a zero
The last critical frequency is a pole
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The slope of the impedance curve is positive at all points
⇒ The INTELSAT-IV satellite launched in 1974 had two earth coverage antenna and two narrower-angle antennas subtending 4.5°. The signal from narrow-angle antenna was stronger than that from earth- coverage antenna by a factor of
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⇒ A network has only independent current sources and resistance. If values of all resistors are doubled, the values of node voltages
will become half
will remain unchanged
will become double
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⇒ The secondary constants of a line are
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Z_{0} and γ
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Z_{0}, γ and L
⇒ Radar reciever has high sensitivity and low noise figure
TRUE
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⇒ A heterodyne frequency changer is called a
Modulator
Mixer
Demodulator
Frequency translator
⇒ A communication channel with AWGN operating at a signal to noise ratio SNR >> 1 and bandwidth B has capacity C_{1}. If the SNR is doubled keeping B constant, the resulting capacity C_{2} is given by
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⇒ The system of the given fi
is unstable for all values of K
is stable for all values of K
can be stable for some values of K
data is insufficient to determine stability
⇒ In a shield helix
the spacing between adjacent turns is very large
the spacing between adjacent turns approaches zero
the spacing between adjacent turns approaches zero and wire thickness approaches zero
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List I | List II | ||
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A. | Television | 1. | Either AM or FM used |
B. | Radio | 2. | Both AM and FM are used |
C. | Radar | 3. | PCM is used |
D. | Data Communication | 4. | Digital system |
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⇒ For the transport lag G(jω) = e^{-jωT}, the phase angle
is constant
varies linearly with frequency
varies linearly with low frequencies only
values as per square law
⇒ A 3 phase star-connected load has one capacitor C in R phase and two equal resistances in Y and B phases.The phase sequence is RBY. Then
V_{B0} > V_{Y0}
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V_{B0} = V_{Y0}
V_{B0} = V_{BY}
⇒ In a bipolar transistor
recombination in base regions of both n-p-n and p-n-p transistor is low
recombination in base regions of both n-p-n and p-n-p transistors is high
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recombination in base region of p-n-p transistor is low but that in n-p-n transistor is high
⇒ 0.1011_{2} = __________ .
0.6875_{10}
0.6800_{10}
0.0100_{10}
0.5000_{10}
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high and high
low and high
high and low
low and low
⇒ The code used to reduce the error due to ambiguity in reading of a binary optical encoder is
Octal code
Excess-3 code
gray code
BCD code
⇒
Assertion (A): In a perfect capacitor, the current density is given by ω ∈_{0}E_{0}∈^{'}_{r}cos(ωt + 90°), where ∈_{r}^{'} is real part of dielectric constant.
Reason (R): In a perfect capacitor, dielectric losses are zero.
Both A and R are true and R is correct explanation of A
Both A and R are true but R is not correct explanation of A
A is true but R is false
A is false but R is true
⇒ A pulse train with a 1 MHz frequency is counted using a 1024 modulus ripple counter using JK flip flops. The maximum propagation delay for each flip-flop should be
1 μs
0.5 μs
0.2 μs
0.1 μs
⇒ If the secondary burden of a CT 15 VA and secondary current is 5 A, the load impedance of CT is
0.6 Ω
5 Ω
6 Ω
10 Ω
⇒ Wave A = 100 sin ωt and wave B = 100 cos ωt. Then
rms values of the two waves are equal
rms values of A is more than that of B
rms values of A is less than that of B
rms values of the two waves may or may not be equal
⇒ In Fortran 77 negation is a unary operation.
TRUE
FALSE
⇒ An increase in temperature increases the width of depletion layer.
TRUE
FALSE
⇒ Two meters X and Y require 40 mA and 50 mA for full scale deflection. Then
X is more sensitive
Y is more sensitive
both are equally sensitive
it is not possible to determine from given data
⇒ In transistor radio receivers the number of IF amplifier stages are
1
2
4
6
⇒ A trinitron colour picture tube uses
three electron guns
one electron gun
one electron gun with three separate in line cathodes
none of the above
⇒ Consider the following
- The first letter of a Java variable is lower case.
- Each successive word in Java variable begins with a capital letter.
- All other letters are lower case.
- A Java variable can have a digit as first character.
All
1, 2, 3 only
1, 2, 4 only
2, 3, 4 only