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Questions + Answers key
Take MCQ Science Test1.
Beams of light are incident through the holes A and B and emerge out of box through the holes C and D respectively as shown in the Figure. Which of the following could be inside the box?
A rectangular glass slab
A convex lens
A convex lens
A prism
2.
Structural formula of ethyne is
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3.
Which one of the following depicts the correct representation of atomic radius(r) of an atom?
(i) and (ii)
(ii) and (iii)
(iii) and (iv)
(i) and (iv)
4.
5.
Chlorine reacts with saturated hydrocarbons at room temperature in the
absence of sunlight
presence of sunlight
presence of water
presence of hydrochloric acid
6.
The device used for producing electric current is called a
generator
galvanometer
ammeter
motor
7.
Fuel used in thermal power plant is
Water
Uranium
Biomass
Fossil fuels
8.
Which is the correct sequence of air passage during inhalation?
Nostrils \(\longrightarrow\) larynx \(\longrightarrow\) pharynx \(\longrightarrow\) trachea \(\longrightarrow\) lungs
Nasal passage \(\longrightarrow\) trachea \(\longrightarrow\) pharynx \(\longrightarrow\) larynx \(\longrightarrow\) alveoli
Larynx \(\longrightarrow\) nostrils \(\longrightarrow\) pharynx \(\longrightarrow\) lungs
Nostrils \(\longrightarrow\) pharynx \(\longrightarrow\) larynx \(\longrightarrow\) trachea \(\longrightarrow\) alveoli
9.
Generally, non-metals are not conductors of electricity. Which of the following is a good conductor of electricity?
Diamond
Graphite
Sulphur
Fullerene
10.
Stainless steel is very useful material for our life. In stainless steel, iron is mixed with
Ni and Cr
Cu and Cr
Ni and Cu
Cu and Au
11.
Which is the correct sequence of the components of a reflex arc?
Receptors \(\rightarrow\) Muscles \(\rightarrow\) Sensory neuron \(\rightarrow\) Motor neuron \(\rightarrow\) Spinal cord
Receptors \(\rightarrow\) Motor neuron \(\rightarrow\) Spinal cord \(\rightarrow\) Sensory neuron \(\rightarrow\)Muscle
Receptors \(\rightarrow\) Spinal cord \(\rightarrow\) Sensory neuron \(\rightarrow\) Motor neuron \(\rightarrow\) Muscle
Receptors \(\rightarrow\) Sensory neuron \(\rightarrow\) Spinal cord \(\rightarrow\) Motor neuron \(\rightarrow\) Muscle
12.
Which of the following are present in a dilute aqueous solution of hydrochloric acid?
\(H_3O^++CH^-\)
\(H_3O^++OH^-\)
\(Cl^-+OH^-\)
unionised HCl
13.
To protect tooth decay we are advised to brush our tech regularly. The nature of the tooth paste commonly used is
acidic
neutral
basic
corrosive
14.
An aqueous solution turns red litmus solution blue. Excess addition of which of the following solution would reverse the change?
Baking powder
Lime
Ammonium hydroxide solution
Hydrochloric acid
15.
A solution turns red litmus blue; its pH is likely to be?
1
4
5
10
1.
(a)
A rectangular glass slab
2.
(a)
3.
(b)
(ii) and (iii)
4.
(d)
5.
(b)
presence of sunlight
6.
(a)
generator
7.
(d)
Fossil fuels
8.
(d)
Nostrils \(\longrightarrow\) pharynx \(\longrightarrow\) larynx \(\longrightarrow\) trachea \(\longrightarrow\) alveoli
9.
(b)
Graphite
10.
(a)
Ni and Cr
11.
(d)
Receptors \(\rightarrow\) Sensory neuron \(\rightarrow\) Spinal cord \(\rightarrow\) Motor neuron \(\rightarrow\) Muscle
12.
(a)
\(H_3O^++CH^-\)
13.
(c)
basic
14.
(d)
Hydrochloric acid
15.
(d)
10
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