General Science Examination 2023

Materials that resist the flow of heat or electricity

<p>Pure water does not have any free ions to carry the charge.</p> Signup and view all the answers

<p>It is range of all colors present in white light, from violet to red, and its arrangement by wavelength.</p> Signup and view all the answers

<p>The heating effect of the current causes the filament to glow.</p> Signup and view all the answers

<p>plane</p> Signup and view all the answers

<p>Concave mirror</p> Signup and view all the answers

<p>3 x 10⁸ m/s</p> Signup and view all the answers

<p>Change in position of an object with respect to time.</p> Signup and view all the answers

<p>straight line</p> Signup and view all the answers

<p>A safety device that protects electrical circuits from overcurrents.</p> Signup and view all the answers

<p>Heat travels in solids through conduction</p> Signup and view all the answers

<p>Electric iron and electric heater</p> Signup and view all the answers

<p>Because of heating effect of electricity, the pan attained high temperature and glowed red.</p> Signup and view all the answers

<p>Ampere</p> Signup and view all the answers

<p>Sonal showed presence of mind, responsibility and concern towards her mother.</p> Signup and view all the answers

<p>It is the bouncing back of light from the surface of a material.</p> Signup and view all the answers

<p>Infinite number of images</p> Signup and view all the answers

<p>It is the splitting of white light into its component colors.</p> Signup and view all the answers

<p>If Assertion is true but Reason is false.</p> Signup and view all the answers

<p>If both Assertion and Reason are true and Reason is the correct explanation of Assertion.</p> Signup and view all the answers

<p>tungsten</p> Signup and view all the answers

<p>Uniform motion is a motion in which an object travels at a constant speed in the same direction. For example, a car traveling at 60 km/h on a straight road is an example of uniform motion. Non-uniform motion is a motion in which an object changes its speed or direction or both. For example, a car accelerating from rest or turning a corner is an example of non-uniform motion.</p> Signup and view all the answers

<p>The car will take 6 hours to cover 300km.</p> Signup and view all the answers

<p>MCBs are used to protect electrical circuits from overloads and short-circuits</p> Signup and view all the answers

<p>The splitting of white light into its component colors when it passes through a prism or a medium with a varying refractive index.</p> Signup and view all the answers

<p>The factors affecting heat generated in a current-carrying wire include the magnitude of the current flowing through the wire, the resistance of the wire, and the time for which the current flows.</p> Signup and view all the answers

<p>The slope of a straight line graph represents the rate of change of the dependent variable with respect to the independent variable.</p> Signup and view all the answers

<p>A simple pendulum consists of a small bob of mass (m) suspended from a fixed point (O) by a light, inextensible string. The time period of a simple pendulum is defined as the time it takes for the pendulum to complete one full oscillation, or one swing back and forth. The time period can be determined by simply measuring the time taken for multiple oscillations and dividing by the number of oscillations.</p> Signup and view all the answers

<p>Amplitude is the maximum displacement of the oscillating object from its equilibrium position. The time period of an oscillation is the time taken by the object to complete one full oscillation.</p> Signup and view all the answers

<p>The graph would show a non-uniform motion as the student's speed would vary due to the crowd.</p> Signup and view all the answers

<p>The speed of the bus is 80 km/h and 22.22 m/s.</p> Signup and view all the answers

<p>a) An object is said to be in motion if its position changes with time, so if an object is moving, even at a very slow speed, its speed cannot be zero. b) Light bulbs use a significant amount of energy to produce light, so they are considered to be power inefficient. c) The word AMBULANCE is written backwards on an ambulance so that drivers in oncoming traffic can read it correctly in their rearview mirror. d) Steel is a ferromagnetic material, which means it is attracted to magnets, so it cannot be used to make electromagnets. e) Concave mirrors can form magnified images, which makes them suitable for shaving mirrors.</p> Signup and view all the answers

<p>A converging mirror, also known as a concave mirror, brings parallel rays of light to a focus. A diverging mirror, also known as a convex mirror, spreads out parallel rays of light making them appear to diverge from a focal point behind the mirror. Refer to the diagram for a visual explanation.</p> Signup and view all the answers

<p>An electric bell is a device that produces sound when an electric current flows through it. When the switch is closed, the circuit is complete, and the electromagnet attracts the hammer. This attracts the hammer toward the gong and causes it to strike it, producing a sound. The hammer then moves away from the gong, breaking the circuit, which causes the electromagnet to lose its magnetic field. The hammer is then pushed back by the spring, completing the circuit again, and the process repeats. Refer to the diagram for a visual explanation.</p> Signup and view all the answers