Maths-
General
Easy
Question
If sec4A = cosec(A – 
) where 4A is an acute angle, find the value of A
- 1/3
- 2/3
- 5/3
- 7/3
The correct answer is: 5/3
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right angled a
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Statement - I One end of ideal massless spring is connected to fixed vertical wall and other end to a block of mass m initially at rest on smooth horizontal surface. The spring is initially in natural length. Now a horizontal force F acts on block as shown. Then the maximum extension in spring is equal to maximum compression in spring.
Statement - II To compress or to expand an ideal unstretched spring by equal amount, same work is to done on spring.
Statement - I One end of ideal massless spring is connected to fixed vertical wall and other end to a block of mass m initially at rest on smooth horizontal surface. The spring is initially in natural length. Now a horizontal force F acts on block as shown. Then the maximum extension in spring is equal to maximum compression in spring.
Statement - II To compress or to expand an ideal unstretched spring by equal amount, same work is to done on spring.
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A hollow vertical cylinder of radius r and height h has a smooth internal surface. A small particle is placed in contact with the inner side of the upper rim, at point A, and given a horizontal speed u, tangential to the rim. It leaves the lower rim at point B, vertically below A. If n is an integer, then–
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physics-General
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A machine, in an amusement park, consists of a cage of the end of one arm, hinged at O. The cage revolves along a vertical circle of radius r (ABCDEFGH) about its hinge O, at constant linear speed v= 
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A machine, in an amusement park, consists of a cage of the end of one arm, hinged at O. The cage revolves along a vertical circle of radius r (ABCDEFGH) about its hinge O, at constant linear speed v= . The cage is so attached that the man of weight 'W' standing on a weighing machine, inside the cage, is always vertical. Then which of the following is correct
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Acceleration versus time graph of a particle moving in a straight line is as shown in adjoining figure. If initially particle was at rest then corresponding kinetic energy versus time graph will be:
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Volt/meter is the unit of
Volt/meter is the unit of
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From methyl alcohol we get:
From methyl alcohol we get:
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Which of the following is oxidised by 
Which of the following is oxidised by
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Calculate the median from the following data:
Calculate the median from the following data:
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Find the mean of the following distribution
Mean = 55
Find the mean of the following distribution
Maths-General
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chemistry-
Phenol, when it first reacts with concentrated sulphuric acid and then with concentrated nitric acid, gives
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In C.G.S. system the magnitude of the force is 100 dyne. In another system where fundamental physical quantities are kilogram, 
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Which is the correct unit for measuring nuclear radii
Which is the correct unit for measuring nuclear radii
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Student I, II and III perform an experiment for measuring the acceleration due to gravity (g) using a simple pendulum. They use different lengths of the pendulum and/or record time for different number of oscillations. The observations are shown in the table
Least count for length = 0.1 cm.
Least count for time = 0.1 s.
If EI,EII and EIII are the percentage errors in g, 
for students I, II and III respectively.
Student I, II and III perform an experiment for measuring the acceleration due to gravity (g) using a simple pendulum. They use different lengths of the pendulum and/or record time for different number of oscillations. The observations are shown in the table
Least count for length = 0.1 cm.
Least count for time = 0.1 s.
If EI,EII and EIII are the percentage errors in g, for students I, II and III respectively.
physics-General
