Q1 NEET 2010 · AIPMT · PRELIMS Easy ☆
Other / Mixed · Crystal structure & bonding
Which one of the following bonds produces a solid that reflects light in the visible region and whose electrical conductivity decreases with temperature and has high melting point?
(a) metallic bonding (b) van der Waal's bonding (c) ionic bonding (d) covalent bonding Show answer and solution
Answer: (a)
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Report a mistake Q2 NEET 2010 · AIPMT · PRELIMS Easy ☆
Other / Mixed · Valves & IC
The device that can act as a complete electronic circuit is
(a) junction diode (b) integrated circuit (c) junction transistor (d) zener diode Show answer and solution
Answer: (b)
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Report a mistake Q3 NEET 2009 · AIPMT Medium ☆
Other / Mixed · Crystal structure & bonding
{} A ˚ \text{\AA} A ˚
(a) 4.3 A ˚ \text{\AA} A ˚ (b) 3.0 A ˚ \text{\AA} A ˚ (c) 8.6 A ˚ \text{\AA} A ˚ (d) 6.8 A ˚ \text{\AA} A ˚ Show answer and solution
Answer: (a)
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Report a mistake Q4 NEET 2008 · AIPMT Medium ☆
Other / Mixed · Crystal structure & bonding
If the lattice parameter for a crystalline structure is 3.6 A ˚ \text{\AA} A ˚
(a) 2.92 A ˚ \text{\AA} A ˚ (b) 1.27 A ˚ \text{\AA} A ˚ (c) 1.81 A ˚ \text{\AA} A ˚ (d) 2.10 A ˚ \text{\AA} A ˚ Show answer and solution
Answer: (b)
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Report a mistake Q5 NEET 2007 · AIPMT Easy ☆
Other / Mixed · Crystal structure & bonding
For a cubic crystal structure which one of the following relations indicating the cell characteristics is correct?
(a) a ≠ \neq = ≠ \neq = α = β = γ \alpha = \beta = \gamma α = β = γ (b) a = b = c and α ≠ β ≠ γ \alpha \neq \beta \neq \gamma α = β = γ (c) a = b = c and α = β = γ \alpha = \beta = \gamma α = β = γ (d) a ≠ \neq = ≠ \neq = α ≠ β ≠ \alpha \neq \beta \neq α = β = γ \gamma γ Show answer and solution
Answer: (c)
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Report a mistake Q6 JEE Main 2006 · AIEEE Medium ☆
Other / Mixed · Crystal structure & bonding
A solid which is not transparent to visible light and whose conductivity increases with temperature is formed by
(a) Ionic bonding (b) Covalent bonding (c) Vander Waals bonding (d) Metallic bonding Show answer and solution
Answer: (b)
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Report a mistake Q7 NEET 2005 · AIPMT Medium ☆
Other / Mixed · Crystal structure & bonding
{} A ˚ \text{\AA} A ˚
(a) 2.54 A ˚ \text{\AA} A ˚ (b) 3.59 A ˚ \text{\AA} A ˚ (c) 1.27 A ˚ \text{\AA} A ˚ (d) 5.08 A ˚ \text{\AA} A ˚ Show answer and solution
Answer: (b)
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Report a mistake Q8 NEET 2002 · AIPMT Easy ☆
Other / Mixed · Crystal structure & bonding
Number of atom per unit cell in B.C.C.
Show answer and solution
Answer: (c)
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Report a mistake Q9 NEET 2001 · AIPMT Medium ☆
Other / Mixed · Crystal structure & bonding
In bcc structure of lattice constant a a a
(a) 3 2 a \frac{\sqrt{3}}{2}a 2 3 a (b) 2 a \sqrt{2}\,a 2 a (c) a 2 \frac{a}{\sqrt{2}} 2 a (d) a 2 \frac{a}{2} 2 a Show answer and solution
Answer: (a)
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Report a mistake Q10 NEET 1999 · AIPMT Medium ☆
Other / Mixed · Crystal structure & bonding
Sodium has body centred packing. If the distance between two nearest atoms is 3.7 Å then the lattice parameter is
(a) 3.3 Å (b) 3.9 Å (c) 4.3 Å (d) 4.8 Å Show answer and solution
Answer: (c)
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Report a mistake Q11 NEET 1996 · AIPMT Easy Old syllabus ☆
Other / Mixed · Valves & IC
When using a triode, as an amplifier, the electrons are emitted by
(a) grid and collected by cathode only (b) cathode and collected by the anode only (c) anode and collected by cathode only (d) anode and collected by the grid and by cathode Show answer and solution
Answer: (b)
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Report a mistake Q12 NEET 1995 · AIPMT Medium Old syllabus ☆
Other / Mixed · Crystal structure & bonding
Distance between body centred atom and a corner atom in sodium (a = 4.225 a = 4.225 a = 4.225
(a) 2.99 Å (b) 2.54 Å (c) 3.66 Å (d) 3.17 Å Show answer and solution
Answer: (c)
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Report a mistake Q13 NEET 1993 · AIPMT Easy Old syllabus ☆
Other / Mixed · Crystal structure & bonding
Diamond is very hard because
(a) it is covalent solid (b) it has large cohesive energy (c) high melting point (d) insoluble in all solvents Show answer and solution
Answer: (b)
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Report a mistake Q14 NEET 1992 · AIPMT Easy Old syllabus ☆
Other / Mixed · Crystal structure & bonding
Which one of the following is the weakest kind of the bonding in solids?
(a) ionic (b) metallic (c) van der Waals (d) covalent Show answer and solution
Answer: (c)
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Report a mistake Q15 NEET 1992 · AIPMT Easy Old syllabus ☆
Other / Mixed · Valves & IC
For amplification by a triode, the signal to be amplified is given to
(a) the cathode (b) the grid (c) the glass envelope (d) the anode Show answer and solution
Answer: (b)
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Report a mistake Q16 NEET 1992 · AIPMT Medium Old syllabus ☆
Other / Mixed · Valves & IC
For an electronic valve, the plate current I I I V V V
(a) I I I V 3 / 2 V^{3/2} V 3/2 (b) I I I V 2 / 3 V^{2/3} V 2/3 (c) I I I V V V (d) I I I V 2 V^{2} V 2 Show answer and solution
Answer: (a)
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Report a mistake Q17 NEET 1990 · AIPMT Easy Old syllabus ☆
Other / Mixed · Valves & IC
When a triode is used as an amplifier the phase difference between the input signal voltage and the output is
(a) 0 0 0 (b) π \pi π (c) π / 2 \pi/2 π /2 (d) π / 4 \pi/4 π /4 Show answer and solution
Answer: (b)
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