Basic Science Test 9

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Basic Science Test 9

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Weekly Quiz Competition

Question 1
1 / -0

The term 'ecosystem' represents a group of living organisms, non-living things such as air, water and soil, and their interaction in the habitat in which they live and thrive. Who first coined the term ecosystem?

A

B

C

D

Solution

The term ecosystem was first used in 1935 in a publication by British ecologist Arthur George Tansley. He was a pioneer in the science of ecology.
Question 2
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What does the chemical symbol Fe stand for?

A
Iron

B
Gold

C
Silver

D
Cheese

Solution
Question 3
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A liquid is following in a horizontal pipe of non-uniform cross section. Which of the following quantities remain change with respect to time ?

A
Kinetic energy per unit volume

B
Pressure energy per unit volume

C
Potential energy per unit volume

D
Speed of flow

Solution

$$\dfrac{1}{2}\rho v_{1}^{2}+P_{1}+\rho gh=$$ Constant $$\rightarrow$$ Bernalli's eq
$$K.E.$$ per unit volume of fluid
Pressure energy per unit volume
Gravitational $$P.E.$$ per unit volume (w.r.t of ref)
speed of flow will change
$$K.E.$$ depends on speed $$\rightarrow K.E.$$ will change
$$\dfrac{1}{2}\rho v_{1}^{2}+P=$$ constant
This will also change
Question 4
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The basic elements of all organic compounds is:

A
Oxygen

B
Hydrogen

C
Nitrogen

D
Carbon

Solution

The basic element of all organic compounds is Carbon. And they are called organic because they associate with living organisms.
So the correct option is 'carbon'.
Question 5
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Which of the following is not part of ecological modernization theory?

A
environmental protection and economic growth are incompatible aims

B
environmental protection cannot be achieved without high tech solutions

C
an ecological form of economic growth is possible

D
consumer demand and market mechanisms can bring about ecologically benign outcomes
Question 6
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The acceleration -time graph of a particle moving in a straight line is as shown in figure. The velocity of the particle at time t=0 in a m/s. The velocity after 2 seconds will be

A
$$6 m/s$$

B
$$4 m/s$$

C
$$2 m/s$$

D
$$8 m/s$$

Solution

The velocity after 2 seconds will be the area under the curve of the Acceleration-time graph.
Area at $$2s = \dfrac{1}{2} \times h \times b = \dfrac{1}{2} \times 4 \times 2 = 4\,m/s.$$
Question 7
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A sphere of mass m is held between two smooth inclined walls. For $$\sin 37^\circ=\frac{3}{5},$$ the normal reaction of the wall (2) is equal to

A
$$\dfrac{16mg}{25}$$

B
$$\dfrac{25mg}{21}$$

C
$$\dfrac{39mg}{21}$$

D
$$mg$$

Solution

In horizontal duration

$$T_{2} \sin(2 \times 37^\circ) = T_{1} \sin37^\circ$$

$$2T_{2} \sin37^\circ \cos37^\circ = T_{1}\sin37^\circ$$

$$2 \times T_{2} \times \dfrac{4}{5} = T_{1}$$

$$T_{1} = \dfrac{8T_2}{5}$$

Now in vertical direction

$$T_{1}\cos37^\circ = mg + T_{2} \cos(2 \times 37^\circ)$$

$$\dfrac{8}{5}T_{2} \times \dfrac{4}{5} = mg + T_{2} \times (-1 + 2\cos^237^\circ)$$

$$\dfrac{32}{25}T_{2} = mg + T_{2} (-1 + 2 \times (\dfrac{4}{5})^2 )$$

$$= \dfrac{32}{25}T_{2} = mg + T_{2} \left ( \dfrac{32}{25} - 1 \right )$$

$$\dfrac{32}{25}T_{2} = mg + \dfrac{7T_2}{25}$$

$$\dfrac{32 - 7}{25}T_{2} = mg$$

$$\dfrac{25}{25}T_{2} = mg$$

$$T_{2} = mg$$
Question 8
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Invention means

A
process of utilising knowledge.

B
some unknown facts.

C
a new utilisation of existing knowledge.

D
ways of classifying things.
Question 9
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A $$0.4\ kg$$ body is rotated with a constant angular speed of $$2\ rps$$ in a vertical circle of radius $$1.2\ m$$ with the help of a string. The tension in the string when it is at the highest point is

A
$$7.98\ N$$

B
$$97.8\ N$$

C
$$72.8\ N$$

D
$$85.7\ N$$

Solution

So, $$IQT=\dfrac {mv^2 }{R}-mg$$
Now, $$W=2z\times 2=4x$$
So, $$T=mw^2R-mg$$
$$=0.4\times 16 z^2 \times 1.2-0.4\times 10$$
$$=16\times 4\times 1.2-4$$
$$=72.8$$
Question 10
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A body partially floats in wafer when

A
The volume of the displaced liquid is equal to the volume of the body

B
The volume of the displaced liquid is greater than the volume of the body

C
The weight of the displaced water is equal to the weight of the body

D
The weight of the displaced water is greater than the weight of the body