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According to Prevost’s theory of heat exchange, the heat exchange shops at
- 273°C
- 5°C
- 273 K
0°C
The sum of the series -2, 6, -18, .... to 7 terms is
1094
-1049
NONE OF THESE
-1094
Simplify: 5a3(-2a)
-10a^4
3a^3
-4a^4
4a^4
What is the heat of formation of 1 mole of H2O(g)
-241.8 kj/mol
-483.6 kj/mol
-571.6 kj/mol
-285.5 kj/mol
A graph between volume (in L) vs. temperature (in oC) at constant pressure on extrapolation cuts the temperature axis at………………
NONE OF THESE
-273oC
-563oC
-123oC
The middle term in the expansion of (x^2 - 2/x)^10 is
-2982x^5
5324x^4
-7362x^4
-8064x^5
The Hα spectral line in Lyman series of hydrogen atomic spectrum is formed due to an electronic transition in hydrogenatom.
The energies associated with the electron in each of the orbits involved in the transition (in kCal mol-1) are
-313.6, –34.84
-78.4, -34.84
-313.6, -78.4
-78.4, -19.6
For the equation, y = (x+
1)(x -
3), what is the value of y when x = 1
-6
-1
-4
-8
∫sin(u)du
-cos(u) + C
ln|secu + tanu)| + C
sec(u)+C
tan(u)+C
∫cosec(u)cot(u)du
sec(u)tan(u) + C
-cosec(u) + C
cosec(u) + C
tan(u) + C
A/c to Fick’s second law , rate of change of concentration with time
(dc/dt)=---
-D(dJ/dx)
(dJ/dx)
D(dJ/dx)
-D(dJ/dt)
∫tan(u)du
-sec^2(u) + C
-cot(u) + C
(1/a)arctan(u/a) + C
-ln|cos(u)| + C
∫cosec(u)du
ln|cosec(u) + cot(u)| + C
tan^2(u) + C
NONE OF THESE
-ln|cosec(u) + cot(u)| + C
A thin concave and a thin convex lens are incontact.
The ratio of the magnitude of power of two lenses is 2/3 and focal length of combination is 30cm, then the focal length of individual lenses are
– 15 cm, 10 cm
– 75 cm, 50 cm
75 cm, - 50 cm
75 cm, 50 cm
The electrophile in this reaction is
:CCl2
+CHCl2
CHCl
CCl3
Tangent to the curve y = x2 + 6 at a point P
(1,
7) touches the circle x2 +y2 16x+ 12y+ c = 0 at a point Q. Then the coordinates of Q are
(–9, –13)
(– 10, – 15)
(–6, –7)
(– 6, –11)
For the graph of y = x^2 - 5, what are the coordinates of the vertex
(0, -15)
(0, -10)
(0, -25)
(0, -5)
∫cos^2(x) =
NONE OF THESE
(1 + cos(2x)) / 2
-cot(u) + C
(1 - cos (2x)) / 2
The numbers x, 8, y are in G.P. and the numbers x, y, -8 are in
A.P. The value of x and y are
NONE OF THESE
(8,8)
(16,4)
(-8,-8)
A student performs an experiment to determine the Young’s modulus of a wire, exactly 2 m long, by Searle’smethod.
In a particular reading, the student measures the extension in the length of the wire to be 0.8 mm with an uncertainty of ±0.05 mm at a load of exactly 1.0 kg. The student also measures the diameter of the wire to be 0.4 mm with an uncertainty of ±0.01 mm. Take g = 9.8 m/s2
(exact). The Young’s modulus obtained from the reading is
(2 .0 ± 0.2) × 1011 N/m2
(2 .0 ± 0.1) × 1011 N/m2
(2 .0 ± 0.05) × 1011 N/m2
(2 .0 ± 0.3) × 1011 N/m2
1
2
30
60
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