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Among the following, correct statement is :
Option: 1 Brownian movement is more pronounced for smaller particles than for bigger–particles.
Option: 2 Sols of metal sulphides are lyophilic.
Option: 3 Hardy Schulze law states that bigger the size of the ions, the greater is its coagulating power.
Option: 4 One would expect charcoal to adsorb chlorine more than hydrogen sulphide.
The mean age of 25 teachers in a school is 40 years. A teacher retires at the age of 60 years and a new teacher is appointed in his place. If now the mean age of the teachers in this school is 39 years, then the age (in years) of the newly appointed teacher is :
Option: 1 25
Option: 2 30
Option: 3 35
Option: 4 40
The line of intersection of the planes and , is:
The tangent at the point (2, −2) to the curve, x2y2−2x=4(1−y) does not pass through the point :
Option: 1 (8,5)
Option: 2 (4,1/3)
Option: 3 (-2,-7)
Option: 4 (-4,-9)
A signal of frequency 20 kHz and peak voltage of 5 Volt is used to modulate a carrier wave of frequency 1.2 MHz and peak voltage 25 Volts. Choose the correct statement.
Option: 1 Modulation index=5, side frequency bands are at 1400 kHz and 1000 kHz
Option: 2 Modulation index=5, side frequency bands are at 21.2 kHz and 18.8 kHz
Option: 3 Modulation index=0.8, side frequency bands are at 1180 kHz and 1220 kHz
Option: 4 Modulation index=0.2, side frequency bands are at 1220 kHz and 1180 kHz
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