mechanics (mass, force, acceleration, work, energy, momentum, velocity) - Category wise Question and Answer Practice Test with Solutions
mechanics (mass, force, acceleration, work, energy, momentum, velocity) PRACTICE TEST [5 - EXERCISES]
set 1
set 2
set 3
set 4
set 5
Question : 1
The number of significant figures in 0.00060 m is
a) 3
b) 2
c) 1
d) 4
Answer »Answer: (b)
According to rules of significant figures.
Question : 2
For a body falling freely under gravity from a height
a) both kinetic energy as well as potential energy go on increasing
b) only the kinetic energy goes on increasing
c) only the potential energy goes on increasing
d) the kinetic energy goes on increasing while potential energy goes on decreasing
Answer »Answer: (d)
Question : 3
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) increased
b) reduced
c) unchanged
d) nothing can be said
Answer »Answer: (c)
Question : 4 [CDS]
The pressure exerted on the ground by a man is greatest
a) when the stands with both foot flat on the ground
b) when the stands on the toes of one foot
c) when the lies down in the ground
d) all of the above yield the same pressure
Answer »Answer: (b)
Question : 5
A particle is projected at some angle from the surface of the planet. The motion of the particle is described by the equation; x = t, y = t - $t^2$ . Then match the following columns and select the correct answer using the codes given below the lists.
Column I (Quantity) | Column II (Magnitude only) |
A. velocity of projection | 1. 1 |
B. acceleration | 2. $√2$ |
C. time of flight | 3. 2 |
D. maximum height attained | 4. $1/4$ |
a) A – 2 ; B – 3 ; C – 1 ; D – 4
b) A – 2 ; B – 1 ; C – 4 ; D – 3
c) A – 1 ; B – 2 ; C – 3 ; D – 4
d) A – 4 ; B – 3 ; C – 2 ; D – 1
Answer »Answer: (a)
A → (2) ; B → (3) ; C→ (1) ; D → (4)
Option: (A) Ux = ${dx}/{dt}$ = 1 and Uy = ${dx}/{dt}$ = 1 – 2t
∴ Ut=0 = √{U2x + y2y} + √{12 + 12}= √2 m/s.
Option: (B) ax = ${d^2 x}/{dt^2}$ = 0
dy = ${d^2 y}/{dt^2}$ = – 2
Option: (C) For the time of flight,
y = 0
or 0 = t – t2
∴ t = 1s.
Option: (D) For maximum height, t = $1/2$ s.
∴ H = t – t2 = $1/2$ - $(1/2)^2$ = $1/4$ m.
IMPORTANT general science mcq EXERCISES
general science mcq CATEGORIES
-
» Measurement And SI Units
-
» Measuring Devices And Scales
-
» Mechanics (Mass, Force, Acceleration, Work, Energy, Momentum, Velocity)
-
» Force Of Gravity, Solids And Fluids
-
» Motion Under Gravity
-
» Physical Properties Of Materials
-
» Light, Heat, Thermodynamics, Wave Motion, Sound, Optics & Oscillations
-
» Electric Current And Magnetism
-
» Nuclear Physics And Conductivity
-
» Modern And Space Physics, Sources Of Energy
-
» General Concepts Of Chemistry
-
» Nature Of Matter And Composition
-
» Atomic Structure Molecules And Nuclear Chemistry
-
» Classification Of Elements, Chemical Bonding, Periodicity In Properties & Physical Transformation
-
» Metals, Non Metals, Minerals, Ores, Properties, Uses
-
» Alloys, Carbon & Its Various Forms, Hydrogen & Compounds, Sulphur, Nitrogen, Halogen & Inert Gases
-
» Acids, Bases, Salts And Metals
-
» Hydrocarbon, Alcohol, Polymer, Organic Acid And Explosive Substance
-
» Fuel, Food Preservation, Nutrition, Medicine, Detergents And Fertilizers
-
» Inorganic Chemistry
-
» Organic Chemistry
-
» Environmental Chemistry
-
» Some Important Man Made Materials
-
» Sub Divisions Of Biology
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» Genetics, Evolution Of Life & Ecological Biodiversity
-
» Taxonomy
-
» Heredity
-
» Biofertilizer
-
» Biological Classification Cell Tissues And Division
-
» Human Anatomy
-
» Blood Transport System
-
» Digestion And Excretion
-
» Photosynthesis
-
» Vitamins, Nutrition, Health, Disease And Treatment
-
» Endocrine Glands, Hormones
-
» Physiology Of Plants, Humans And Animals
-
» Reproduction
-
» Genetic Engineering And Bio Technology
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