Practice Section 1 question answer - general science mcq Online Quiz (set-1) For All Competitive Exams
Q-1) The number of significant figures in 0.00060 m is
(a)
(b)
(c)
(d)
According to rules of significant figures.
Q-2) Two teams are pulling a rope with equal and opposite forces each of 5 kN in a tug of war so that a condition of equilibrium exists. What will be the tensile force in the rope?
(a)
(b)
(c)
(d)
Q-3) Two masses m and 9 m are moving with equal kinetic energies. The ratio of the magnitudes of their momenta is
(a)
(b)
(c)
(d)
Q-4) Which of the following is not a vector quantity?
(a)
(b)
(c)
(d)
Q-5) A jet engine works on the principle of conservation of
(a)
(b)
(c)
(d)
Q-6) A person swims in a river aiming to reach exactly on the opposite point on the bank of a river. His speed of swimming is 0.5 m/s at an angle of 120º with the direction of flow of water. The speed of water is
(a)
(b)
(c)
(d)
Here v = 0.5 m/sec. u = ?So, sinϴ = $u/v ⇒ u/0.5 =1/2 (or) u = 0.25 ms^{-1}$
Q-7) A parrot is sitting on the floor of a closed glass cage which is in a boy’s hand. If the parrot starts flying with a constant speed, the boy will feel the weight of the cage as
(a)
(b)
(c)
(d)
Q-8) Consider the following statements:
A 4-wheel vehicle moving in a sharp circular path at high speed will :
- overturn about its outer wheels
- overturn about its inner wheels
- skid outwards
- skid inwards
Which of these statements are correct?
(a)
(b)
(c)
(d)
In the case of an object moving along a circular path two types of forces centripetal and centrifugal act upon it.
As they have opposite impacts thus, the object remains in balance. When centrifugal force gets disturbed then the object will leave the balance and skid in an outward direction.
Q-9) A vector quantity is a physical quantity which needs
(a)
(b)
(c)
(d)
A physical quantity which can be specified completely by giving a single number and the appropriate unit alongside it is known as a scalar quantity. Scalar quantities that have the same physical units can be added or subtracted according to the strict mathematical rules of algebra for numbers.
There are a lot of physical quantities which cannot be described by just a single number of physical units. For example in order to fetch a ball which is thrown it is not only important to know the speed with which it is thrown but also the direction in which it is thrown so that it is easier to locate the ball. Physical quantities which are specified completely by giving a number of units (magnitude) and a direction alongside it are known as vector quantities.
Thus we see that a vector quantity has both magnitude and direction.
Thus, we see that the correct answer to this question is (B).
Q-10) A couple is acting on a two particle systems. The resultant motion will be
(a)
(b)
(c)
(d)