Physic English

Question. The best malleable metal is -

Ans: Gold

Question. The early attempt to classify elements as metals and non-metals was made by -

Ans: Lavoisier

Question. The magnet is strongest near the -

Ans: Ends of the magnet

Question. Which is the device used to detect and measure small electric current in a circuit?

Ans: Galvanometer

Question. The lowest temperature at which an oil gives sufficient vapours to form an explosive mixture with air is known as -

Ans: Flash Point

Question. The value of G in the formula for gravitational force depends on -

Ans: Neither mass nor the radius of earth

Question. When a hanging carpet is beaten with a stick, the dust particles in it start coming out of it. This phenomenon can be explained by making use of -

Ans: Newton's first law of motion

Question. The numerical ratio of displacement to distance for a moving object is -

Ans: Equal to 1 or less than 1

Question. Who was the first scientist of the world to use the symbols to represent elements in a shortwa

Ans: Dalton

Question. Milk of Magnesia is a -

Ans: Suspension

Question. Which mineral is also known as fool's gold?

Ans: Pyrite

Question. The physics phenomenon when, in polar regions like Alaska and Northern Canada, a splendid display of colours is seen in the sky is called a/an -

Ans: aurora borealis

Question. Which of the following metals in pure form has the highest melting point?

Ans: Tungsten

Question. Which of the following is not a characteristic of a physical change?

Ans: It is usually an irreversible change

Question. Sound cannot travel through -

Ans: Vaccum

Question. What is the correct ascending order of the following substances in relation to their density (kg/ m3)?

Ans: Aluminium, Iron, Mercury, Gold

Question. Which of the following metals is not strong?

Ans: Sodium

Question. The device used for producing electric current is called -

Ans: Generator

Question. Sun derives its energy from -

Ans: The fusion of hydrogen nuclei into helium nuclei

Question. Which of the following materials cannot be used to make a lens?

Ans: Clay

Question. Which one of the following is a non-metallic mineral?

Ans: Mica

Question. Radiations coming form the Sun are mostly in the form of -

Ans: both short and long wavelength infrared

Question. The temperature of a place on one sunny day is 113 in Fahrenheit scale. The Kelvin scale reading of this temperature will be -

Ans: 318 K

Question. Light rays move in straight lines. But through an optional fiber, they can move in any type of zigzag path because -

Ans: successive total internal reflections occur as a ray moves through the fiber

Question. The loudness of sound depends upon the -

Ans: amplitude of the sound waves

Question. Net movement of water from a dilute to a concentrated solution through a selectively permeable membrane is called -

Ans: Osmosi

Question. 10 g of ice at -100C is mixed with 10 g of water at 00C. The amount of heat required to raise the temperature of mixture to 100C is -

Ans: 1050 cal

Question. If the work done on the system or by the system is zero, which one of the following statements for a gas kept at a certain temperature is correct?

Ans: Change in internal energy of the system is equal to flow of heat in or out of the system

Question. A student measures certain lengths using a meter scale having least count equal to 1 mm. Which one of the following measurements is more precise?

Ans: 0.925 m

Question. The sum of emf's and potential differences around a closed loop equals zero is a consequence of -

Ans: Conservation of energy

Question. The raw materials used for the manufacture of Portland cement are -

Ans: Lime, silica and alumina

Question. Which one of the following statements is correct?

Ans: Boiling is a bulk phenomenon, but evaporation is a surface phenomenon

Question. Which one of the following statements about glass is not correct?

Ans: Soda glass is harder than Pyrex glass

Question. When a ball bounces off the ground, which of the following changes suddenly?

Ans: Its momentum

Question. Which one of the following statements regarding Ohm's law is not correct?

Ans: All homogeneous materials obey Ohm's law irrespective of whether the field is within range or strong

Question. In which of the following phenomena do heat waves travel along straight line with the speed of light?

Ans: Thermal radiation

Question. A thin disc and a thin ring, both have mass M and radius R. Both rotate about axes through their center of mass and are perpendicular to their surfaces at the same angular velocity. Which of the following is true?

Ans: The ring has higher kinetic energy

Question. First electro chemical cell was designed by -

Ans: Georges Lechlanche

Question. The velocity of sound in any gas depends upon -

Ans: Density and elasticity of gas

Question. It is difficult to cook at high altitude because -

Ans: Due to decrease in atmospheric pressure the boiling point of water decreases

Question. The poorest conductor of heat among the following is -

Ans: mercury

Question. Which of the following does not change when light travels from one medium to another?

Ans: Frequency

Question. 'Light-year' is a unit of -

Ans: distance

Question. Faraday constant -

Ans: depends on the volume of the solvent in which the electrolyte is dissolved

Question. On heating, the resistance of a semiconductor -

Ans: decreases

Question. The total resistance of a circuit having two parallel resistors is 1.403 kilo-ohm. If one of the resistors is 2.0 kilo-ohm, then the other resistor will be -

Ans: 4.70 kilo-ohm

Question. People prefer to wear cotton clothes in summer season. This is due to the fact that cotton clothes are -

Ans: good absorbers of water

Question. The frequency (in Hz) of a note that is one octave higher than 500 Hz is -

Ans: 1000

Question. If the speed of a moving magnet inside a coil increases, the electric current in the coil -

Ans: increases

Question. If an object is at rest, then the time (X-axix) versus distance (Y-axis) graph -

Ans: is horizontal

Question. Rate of evaporation increases with -

Ans: an increase of surface area

Question. The value of the slope of a normal demand curve is -

Ans: negative

Question. Magnification is -

Ans: observed size of specimen/ actual size

Question. Which one of the following is active transport?

Ans: It is the movement of a substance against a diffusion gradient with the use of energy from respiration.

Question. Rutherford's alpha-particle scattering experiment on thin gold foil was responsible for the discovery of -

Ans: atomic nucleus

Question. The rate of evaporation of liquid does not depend upon -

Ans: Its mass

Question. Bose-Einstein Condensate is -

Ans: fifth state of matter

Question. Which one of the following instruments is used for locating submerged objects in the ocean?

Ans: Sonar

Question. Which of the following is a naturally occurring hardest substance on the earth?

Ans: Diamond

Question. Driving force of an ecosystem is -

Ans: Solar energy

Question. An ultimate source of energy stored in fossil fuels is -

Ans: Sun

Question. Which one of the following colours of white light is least deviated by the glass prism?

Ans: Red colour

Question. Which of the following is used in fire alarm?

Ans: Photo cell

Question. A 100 W electric bulb is used for 10 hours a day. How many units of energy are consumed in 30 days?

Ans: 30

Question. An echo is heard after 5 seconds of the production of sound which moves with a speed of 340 m/s. What is the distance of the mountain from the source of sound which produced the echo?

Ans: 0.85 km

Question. What is the more common name for solid carbon dioxide?

Ans: Dry Ice

Question. Which of the following is a highly reactive metal?

Ans: Sodium

Question. Food cans are coated with tin and not zinc because -

Ans: Zinc is more reactive than tin

Question. Which metal is used for making the filaments of electric bulbs?

Ans: Tungsten

Question. The correct relation between the radius of curvature R and focal length f of a spherical mirror is -

Ans: R = 2f"

Question. A lemon kept in water in a glass tumbler appears to be larger than its actual size. It is because of -

Ans: refraction of light

Question. Name the scientist who first used a glass prism to obtain the spectrum of sunlight -

Ans: Isaac Newton

Question. This cost of energy to operate an industrial refrigerator that consumes 5 kW power working 10 hours per day for 30 days will be -(Given that the charge per kW.h of energy = Rs. 4)

Ans: Rs. 6,000

Question. Which one of the following statements regarding magnetic field is not correct?

Ans: Magnetic field lines are open curves

Question. Which one of the following types of radiations has the smallest wavelength?

Ans: X-rays

Question. The instrument used for detecting the presence of electric current in a circuit is -

Ans: Galvanometer

Question. The Sun appears reddish during sunrise and sunset. The phenomenon in optics which is responsible for this appearance of the Sun is -

Ans: Scattering

Question. A lens has a power of + 2.0 Diopter. Which one of the following statements about the lens is true?

Ans: The lens is convex and has a focal length of 0.5 meter

Question. Which one of the following was the first mineral acid discovered?

Ans: Sulphuric

Question. In case of a concave mirror, if an object is kept between principal focus F and pole P of the mirror, then which one of the following statements about the image is not correct?

Ans: The image will be formed at infinity

Question. In an incandescent electric bulb, the filament of the bulb is made up of which metal?

Ans: Tungsten

Question. Which one of the following is not the unit of energy?

Ans: Newton-metre

Question. Two planets orbit the Sun in circular orbits, with their radius of orbit as R1 = R and R2 = 4 R. Ratio of their periods (T1/T2) around the Sun will be -

Ans: 1/ 2

Question. A metallic wire having resistance of 20 Ω is cut into two equal parts in length. These parts are then connected in parallel. The resistance of this parallel combination is equal to -

Ans: 5 Ω

Question. Light of uniform intensity impinges perpendicularly on a totally reflecting surface. If the area of the surface is halved, the radiation force on it will become -

Ans: half

Question. Which one of the following statements about sound is not correct?

Ans: Sound waves are transverse waves

Question. When the short circuit condition occurs, the current in the circuit -

Ans: increases substantially

Question. Which of the following statements is not correct regarding the travel of sound waves?

Ans: Sound waves can travel through vacuum

Question. Sound velocity is usually larger in solids than in liquids and gases because -

Ans: solids are more elastic than liquids and gases

Question. A container is filled with water at 40C. The water will overflow if the temperature of water is -

Ans: Increased or decreased

Question. The pencil leads are made of mainly -

Ans: Graphite

Question. Which of the following is a real image?

Ans: The image of actors formed on a cinema screen

Question. In which of the following metals did the Karddamaka Kshatrapas issue the very rare coins?

Ans: Copper

Question. A measured temperature in Fahrenheit scale is 2000F. What will be its value in Celsius scale?

Ans: 93.30C

Question. Ball bearings are used in bicycles, cars, etc., because -

Ans: the effective area of contact between the wheel and axle is reduced

Question. Liquid water is denser than ice due to -

Ans: Oxygen Bonding

Question. The surface of a lake is frozen in severe winter, but the water at its bottom is still liquid. What is the reason?

Ans: The density of water is maximum at 40C

Question. Newton's first law of motion is known as -

Ans: Law of Inertia

Question. Milarite is the ore of -

Ans: Nickel

Question. Black-hole is -

Ans: a collapsed star

Question. Which one of the following is associated with 'Albedo'?

Ans: Reflecting power

Question. The phenomenon used in optical fibre for transmission of light energy is -

Ans: Total internal reflection

Question. The unit of electric power is -

Ans: watt

Question. The device to measure electric current is -

Ans: ammeter

Question. What is measured in Hertz?

Ans: Frequency

Question. Sound wave in air is -

Ans: longitudinal

Question. Which one of the following quantities does not have unit?

Ans: Strain

Question. Which one of the following is a scalar quantity?

Ans: Pressure

Question. The sunlight from the sun to the earth reaches in -

Ans: 8 minutes

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