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Assertion (A): A ball is moving fast on smooth surface than rough surface even you apply same force on it.
D) Both Assertion and Reasons are correct and “R” is correct explanation for Assertion.
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If `f: R to R and g: R to R ` be two functions defined as f(x)=2x+1 and `g(x)=x^(2)-2` respectively , then find (gof) (x) and (fog) (x) and show that
Correct Answer - `(gof)(x)=4x^(2)+4x-1, (fog)(x)=2x^(2)-3`
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Which element has the most negative electron gain enthalpy?
Correct option is : (C) Chlorine In general the electron gain enthalpy (magnitude) increases along a period as we move from left to right and decreases as we move down in...
2 Answers 1 views
An aeroplane takes 1 hour less for a journey of 1200 km if its speed is increased by 100 km/hr from its usual speed. Find its usual speed.
Let usual speed of aeroplane be x km/hr. Given, distance =1200 km Time taken for journey of 1200 km `=(1200)/(x) "hours"" "(because "Time"="Distance"/"Speed")` When the speed is increased by 100...
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A man is running with a constant acceleration on a plank which is placed on a horizontal smooth surface. Then choose the correct option(s):
Correct Answer - B, C
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A particle of mass m is placed upon the smooth face of a prism, also of mass m, which particle is placed , is inclined at an angle `alpha` to the hori
Correct Answer - N//A
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Statement I: In any ionic solid `[MX]` with Schottky defect, the number of positive and negative ions are same. Statement II: An equal number of catio
Correct Answer - a Both assertion and reason are true and the reason is the correct explanation of the assertion
2 Answers 1 views
It is full of both thrill and excitement for the spectators. (Negative sentence)
It is full of not only thrill but also excitement for the spectators.
2 Answers 3 views
We must try our best to improve its present position. (Negative sentence without changing meaning)
We cannot but try our best to improve its present position.
2 Answers 1 views
It has become a common affair in most of the cities and towns. (Negative)
It has not become an uncommon affair in most of the cities and towns.
2 Answers 1 views