Physics Class 10 Quiz

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Questions and Answers

What is the angle called when the outer edge is raised above the inner edge?

Angle of repose

Angle of banking (correct)

Angle of declination

Angle of inclination

What will happen to a model aeroplane when the thread holding it breaks while flying in a circle?

Directly to the center of the circle

In a straight line at a tangent (correct)

In an upward arc

In a circular path, as before

What type of force acts for a small time and varies with time?

Electromagnetic force

Impulsive force (correct)

Electrostatic force

Centripetal force

What does the term 'banking of roads' refer to?

Inclining the roadway at an angle Signup and view all the answers

Which quantity is a vector quantity?

Force Signup and view all the answers

What is the relationship between impulse and linear momentum?

Impulse is the change in momentum Signup and view all the answers

What does centripetal force act on?

Objects moving in a circular path Signup and view all the answers

What happens to a gun when a bullet is fired?

It accelerates backward due to recoil Signup and view all the answers

What does the principle of homogeneity of dimensions state?

The dimensions of all terms on both sides of an equation must be the same. Signup and view all the answers

Why is dimensional analysis useful?

It is used to check the correctness of a physical equation. Signup and view all the answers

In the equation S = ut + ½ at², what are the dimensions of S?

[L1T-2] Signup and view all the answers

Which of the following statements is true regarding dimensional homogeneity?

The left-hand side and right-hand side must have matching dimensions. Signup and view all the answers

What dimensions correspond to acceleration in the context discussed?

[L1T-2] Signup and view all the answers

Which of the following illustrates the principle of homogeneity of dimensions?

Equating different units like meters and seconds is inappropriate. Signup and view all the answers

Which use of dimensional equations is primarily for converting quantities?

Changing units from one system to another. Signup and view all the answers

What incorrect assumption might one make about the terms in S = ut + ½ at²?

Distance can be equated to time. Signup and view all the answers

What is linear velocity defined as?

The time rate of change of displacement Signup and view all the answers

What is the SI unit of acceleration?

m/s² Signup and view all the answers

What characterizes a vector quantity?

It has both magnitude and direction Signup and view all the answers

When is acceleration considered negative?

When velocity decreases over time Signup and view all the answers

What is the effect of a force on a body at rest?

It can change the position of the body Signup and view all the answers

What does the resolution of a force involve?

Breaking a single force into components Signup and view all the answers

What is the dimension formula for force?

[MLT-2] Signup and view all the answers

What is the resultant force obtained from the components along the x and y-axis?

$F = \sqrt{F_x^2 + F_y^2}$ Signup and view all the answers

What is the SI unit of work?

Joule Signup and view all the answers

If a force of 50 N is applied at an angle of 30° to move an object 10 m, what is the work done?

612.4 J Signup and view all the answers

When no displacement occurs, what is the work done on an object?

Zero work Signup and view all the answers

Which scenario represents work done in physics?

Lifting a weight vertically Signup and view all the answers

What is the total mass of a man weighing 50 kg who supports a body of 25 kg?

75 kg Signup and view all the answers

What is the work done when a person carries a load along a horizontal path?

Zero Signup and view all the answers

What type of quantity is energy in relation to work?

Scalar quantity Signup and view all the answers

If 1 Joule equals how many ergs in the CGS system?

10^7 ergs Signup and view all the answers

What does the resultant of two vectors represented by the two sides of a triangle provide?

Magnitude and direction by the third side taken in the opposite order. Signup and view all the answers

Which formula correctly represents the magnitude of the resultant for two vectors using the triangle law?

𝑅 = √𝐴⃗2 + 𝐵2 + 2𝐴⃗𝐵 𝑐𝑜𝑠 𝜃 Signup and view all the answers

What is the relationship between the vectors in the parallelogram law?

They act simultaneously and can be represented by adjacent sides of a parallelogram. Signup and view all the answers

What type of quantity is distance classified as?

Scalar quantity. Signup and view all the answers

The direction of the resultant vector can be derived using which formula in the triangle law?

tan β = 𝐵 sin θ / (𝐴⃗ + 𝐵 cos θ) Signup and view all the answers

Which product is NOT a characteristic of the scalar (or dot) product?

It depends on the sine of the angle between the vectors. Signup and view all the answers

What does the vector (or cross) product produce?

A vector having a magnitude equal to the product of the magnitudes and sine of the angle. Signup and view all the answers

Which statement accurately defines velocity?

It is the rate of change of displacement. Signup and view all the answers

What is the definition of rotational motion?

Motion of a body about a fixed axis Signup and view all the answers

Which formula correctly represents torque?

τ = F × r Signup and view all the answers

Angular momentum can be expressed as which of the following formulas?

L = p × r Signup and view all the answers

What is the law of conservation of angular momentum?

Total angular momentum remains constant when no external torque acts. Signup and view all the answers

Which statement about moment of inertia is true?

It is a measure of an object's resistance to angular acceleration. Signup and view all the answers

What effect does pulling in arms have on an ice skater's rotation speed?

The skater spins faster. Signup and view all the answers

In the absence of external torque, what happens to angular momentum over time?

It remains constant. Signup and view all the answers

Study Notes

General Physics Phys.101 (Properties of Matter)

This course covers the properties of matter
The course is instructed by Dr. Maha Reda
Learning objectives include understanding physical quantities, fundamental and derived units, different systems of units, defining dimensions, formulating dimensional formulae, writing dimensional equations and applications

Units and Dimensions

Physics: The branch of science dealing with the study of nature and properties of matter and energy
Physical Quantities: Quantities in terms of which laws of physics can be expressed and measured
Measurement: The process of comparing an unknown physical quantity with a known fixed quantity (known as a unit)
Unit: A known fixed quantity used for measurement; for example, metre for length
Fundamental Units: Independent quantities not dependent on other physical quantities (e.g., mass, length, time)
Derived Units: Quantities derived from fundamental quantities (e.g., area, speed)
Systems of Units: Common systems used for measurement (e.g., CGS, FPS, MKS, SI)
SI system: An improved and extended version of the MKS system of units. It's the International System of Units
Advantages of SI System:
- It's a coherent system where derived units are easily obtained
- It's a rational system with only one unit per physical quantity
- It's a metric system allowing for multiples and submultiples expressed in powers of 10
Basic Units of SI System:
- Length: Metre (m)
- Mass: Kilogram (kg)
- Time: Second (s)
- Temperature: Kelvin (K)
- Electric Current: Ampere (A)
- Luminous Intensity: Candela (Cd)
- Amount of Substance: Mole (mol)
Supplementary Units of SI System:
- Plane angle: Radian (rad)
- Solid angle: Steradian (sr)

Definition of Basic and Supplementary Units

Metre (m): The length of the path traveled by light in vaccum during a time interval of 1/299,792,458 of a second
Kilogram (kg): The mass of the platinum-iridium prototype kept by the International Bureau of Weights and Measures
Second (s): The duration of 9,192,631,770 periods of the radiation corresponding to the transition between two hyperfine levels of the ground state of cesium-133 atom
Ampere (A): The intensity of a constant current that, if maintained in two straight parallel conductors of infinite length, negligible circular cross-section, and placed 1 metre apart in vacuum, would produce between these conductors a force equal to 2 × 10⁻⁷ Newton per metre of length
Kelvin (K): The fraction 1/273.16 of the thermodynamic temperature of the triple point of water
Candela (Cd): The luminous intensity, in a given direction, of a source that emits monochromatic radiation of frequency 540 x 10¹² hertz and that has a radiant intensity in that direction of 1/683 watt per steradian
Mole (mol): The amount of substance of a system which contains as many elementary entities as there are atoms in 0.012 kilogram of carbon-12
Radian (rad): The plane angle subtended at the center of a circle by an arc of the circle equal to its radius
Steradian (sr): The solid angle subtended at the center of a sphere by a surface area of the sphere having magnitude equal to the square of its radius

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Description

Test your understanding of key concepts in Physics Class 10 with this quiz. Questions cover topics like forces, motion, and the dynamics of objects in circular paths. Challenge yourself and see how well you grasp these fundamental principles!