Question is ⇒ Assertion (A): Diamond and carborudum are both very hard materials.Reason (R): Valence band can be extremely strong., Options are ⇒ (A) Both A and R are true and R is correct explanation of A, (B) Both A and R are true but R is not correct explanation of A, (C) A is true but R is false, (D) A is false but R is true, (E) , Leave your comments or Download question paper.

Question is ⇒ Assertion (A): Diamond and carborudum are both very hard materials.Reason (R): Valence band can be extremely strong., Options are ⇒ (A) Both A and R are true and R is correct explanation of A, (B) Both A and R are true but R is not correct explanation of A, (C) A is true but R is false, (D) A is false but R is true, (E) , Leave your comments or Download question paper. Previous question Next question


Q1.	Assertion (A): Diamond and carborudum are both very hard materials. Reason (R): Valence band can be extremely strong.
A.	Both A and R are true and R is correct explanation of A [Correct Answer]
B.	Both A and R are true but R is not correct explanation of A [Wrong Answer]
C.	A is true but R is false [Wrong Answer]
D.	A is false but R is true [Wrong Answer]
View Answer 1 -1 Explanation:- Answer : A Discuss it below : !! OOPS Login [Click here] is required to post your answer/result Help other students, write article, leave your comments

Previous question Next question

Also Read Similar Questions Below :

⇒ The box on the external left of the title bar of menu is called control menu box.
TRUE
FALSE

⇒ A 5000 W signal is attenuated by - 196 dB. The resultant signal strength is
1.26 x 10⁶ W
1.26 x 10^-2 W
1.26 x 10^-8 W
1.26 x 10^-16 W

⇒ Under identical conditions, for a single modulating frequency, FM and PM are indistinguishable. Now if the modulating frequency is reduced, then
phase modulation index as well as frequency modulation index decrease
phase modulation index as well as frequency modulation index increase
phase modulation index will remain constant whereas frequency modulation index will increase
phase modulation index will decrease whereas frequency modulation index will remain constant

⇒ The correct relation between joules and calories is
calories = joules/4.156
joules = calories/4.156
calories = joules x 10⁷/4.156
joules = calories x 10⁷/4.156

⇒ If the temperature of an extrinsic semiconductor is increased so that the intrinsic carrier concentration is doubled, then
the majority carrier density is doubled
the minority carrier density is doubled
the minority carrier density becomes 4 times the original value
both the majority and minority carrier densities double

⇒ If sequence currents I_a1 = 2 ∠- 90°, I_a2 = 0.2 ∠ 90° and I_a3 = 1.8 ∠ 90°, I_a =
0
1
4
8

⇒ Fortran 77, C and Pascal are high level languages.
TRUE
FALSE

⇒ AM amplifier having noise figure of 20 dB and available power gain of 15 dB is followed by a mixer circuit having noise figure of 9 dB. The overall noise figure as referred to input in dB is
10.44
11.07
21.52
0.63

⇒ The signal to noise ratio in telemetry should be better than
5 db
10 db
25 db
60 db

⇒ For a 50 Ω resistor for 3 GHz application, the stray capacitance should be less than
1 μF
1 nF
1 pF
0.1 pF

⇒ In 8085 the data is stored in the stack on
First in First Out basis
Last in First Out basis
First in Last Out basis
Last in Last Out basis

⇒ In a Parallel connection of circuit the bandwidth in terms of R, L, C is
B = 1/RC
B = 1/RL
B = 1/RLC
B = RLC

⇒ On which bands, do the optical fibers operate?

Ultra violet band
Ultra high frequency band
Visible light band
Infrared band

Select the correct answer from the codes given below:
1 only
1 and 2 only
1, 2 and only
1, 3 and 4

⇒ Consider the following logical IF statement in FORTRAN 77 IF (SALT - PEPPER) 11, 11, 13
IF (SALT - PEPPER) 13, 11, 13
IF (SALT - PEPPER) 13, 11, 11
IF (SALT - PEPPER) 11, 13, 13

⇒ With reference to C programming language, which of the following statements are correct?

An identifier may start with an underscore.
An identifier may end with an underscore.
If is a valid identifier.
The number of significant characters in and identifier is implementation dependent.

Select the correct answer from the codes given below:
1 and 2 only
2 and 3 only
1, 2, 3 and 4
3 and 4 only

⇒ Which one is correct?
Sky wave propagation (2 to 30 MHz)
Space wave propagation (> 30 MHz)
Tropospheric propagation (> 300 MHz)
All of the above

⇒ The units for electric dipole moment are
coulombs
colomb-metre
coulomb/metre
coulomb/m²

⇒ The Fourier series of a real periodic function has only

Cosine terms if it is even
Sine terms if it is even
Cosine terms if it is odd
Sine terms if it is odd

Which of the above statements are correct?
(1) and (4)
(1) and (2)
(2) and (4)
(2) and (3)

⇒ The z-transform of a particular signal is gi
casual and stable
non-casual and stable
non-casual and unstable
casual and unstable

⇒ Ferrite have
low copper loss
low eddy current loss
low resistivity
higher specific gravity compared to iron

⇒ The voltage e₀ in the fi
48 V
24 V
36 V
28 V

⇒ It is required to measure the true open circuit emf of a battery. The best device is
dc voltmeter
ammeter and known resistance
dc potentiometer
either (a) or (c)

⇒ The conductivity of a semiconductor crystal due to any current carrier is not proportional to
mobility of the carrier
effective density of states in the conduction band
electronic charge
surface states in the semiconductor

⇒ The expression Y (A, B, C) = ∑m (1, 3, 5, 6) is to realized using a multiplexer. Then
use 8 : 1 multiplexer and ground input lines 1, 3, 5, 6
use 8 : 1 multiplexer and ground input lines 0, 2, 4, 7
use 8 : 1 multiplexer and ground input lines 0, 1, 2, 3
use 8 : 1 multiplexer and ground input lines 4, 5, 6, 7

⇒ The fixed count that should be used so that the output register will represent the input for a 6 bit dual slope A/D converter uses a reference of -6v and a 1 MHz clock. It uses a fixed count of 40 (101000).
110
10
1111
11101

⇒ Most of the digital computers do not have floating-point hardware because
floating point hardware is costly
it is slower than software
it is not possible to perform floating point addition by hardware
of not specific reason

⇒ The pole zero plot in the given figure is
non-minimum phase function
minimum phase function
all pass function
either (a) or (b)

⇒ Modem warfare has changed from large scale clashes of armies to suppression of civilian populations. Chemical agents that do their work silently appear to be suited to such warfare; and regretfully, there exist, people in military establishments who think that chemical agents are useful tools for their cause, which of the following statements best sums up the meaning of the above passage:
Modem warfare has resulted in civil strife.
Chemical agents are useful in modem warfare.
Use of chemical agents in warfare would be undesirable.
People in military establishments like to use chemical agents in war.

⇒ A certain transistor has a_dc of 0.98 and a collectors leakage current of 5 μA. If I_E = 1 mA, the base current will be
35 μA
25 μA
15 μA
5 μA

⇒ An electric heater is controlled by thyristors through on-off control. If a = 0.4, the heating is
16% maximum
40% of maximum
60% of maximum
84% of maximum