Class 10 Physics Half-Yearly Exam

Physics Class 10 Half-Yearly Examination

SECTION 1

• Ohm's law can be verified using a circuit diagram
• When an atom emits an alpha and beta particle, the number of protons and neutrons in the resulting element can be calculated
• A knife is a type of second-class lever
• The principle of calorimetry is a scientific principle used to measure heat transfer
• Terminal p.d and e.m.f of a cell are two different concepts in physics

Physics Concepts

• Workdone on an object can be calculated using the formula: Work = Force x Distance
• Resistance of a conductor is related to its mass per unit length and density
• Energy changes occur in photovoltaic cells and electromagnets when in use
• Temperature differences occur between the top and bottom of a water fall due to thermal equilibrium
• Electrical gadgets in houses are connected in parallel for safety reasons

Physics in Daily Life

• A boy's weight on the moon is different from his weight on earth due to gravity
• The unit of work is the same as the unit of energy
• The energy changes in a system occur due to the interaction between the system and its surroundings
• The temperature of water at the bottom of a water fall is different from the temperature at the top due to thermal equilibrium

SECTION 2

Energy and Work

• Energy is conserved in a freely falling body
• The weight of an object can be calculated using its mass and gravity
• A block and tackle system can be used to lift heavy loads with less effort
• The velocity ratio of a pulley system is 5, which means the effort required to lift a load is reduced by 5 times

Light and Optics

• The power of a lens is defined as the reciprocal of its focal length
• A concave lens can form an erect and magnified image of an object
• The angle of incidence is equal to the angle of reflection in a mirror
• The magnification of an image can be calculated using the formula: Magnification = -di/do

Electromagnetic Waves

• Electromagnetic waves have wavelength and frequency
• The speed of electromagnetic waves in vacuum is 3 x 10^8 m/s
• X-rays have a wavelength of 50 A° and are used in medical imaging
• Radar signals can be used to detect objects at a distance

Thermal Properties

• Specific heat capacity is the amount of heat required to raise the temperature of 1 kg of a substance by 1°C
• Thermal capacity is the product of specific heat capacity and mass of a substance
• Latent heat of fusion is the amount of heat required to change the state of a substance from solid to liquid
• Copper is a good conductor of heat due to its high specific heat capacity