Q. A convex lens has a focal length of 15 cm. At what distance should an object be placed in front of the lens to get a real image of the same size as the object?
1) 15 cm
2) 10 cm
3) 30 cm
4) 40 cm
Q. The twinkling of a star is due to -
1) atmospheric reflection of starlight
2) atmospheric refraction of starlight
3) continuous change in the position of the star
4) oscillation of starlight
Q. An object weighs 9 N on the surface of the Earth. What would be its weight, when measured on the surface of a planet where the acceleration due to gravity is 9 times that on the surface of the Earth?
1) The weight would remain the same
2) The weight would be equal to 1 N
3) The weight would become 9 times
4) The weight will be reduced to 1/9 N
Q. Which one of the following statements is true with regard to the greenhouse?
1) The shorter-wavelength infrared radiations from the Sun can enter into the greenhouse while longer-wavelength infrared radiations from the ground and the plants inside the greenhouse cannot pass back out through the glass
2) The shorter wavelength infrared radiation from the Sun can enter into the greenhouse and the longer wavelength infrared radiation from the ground and the plants inside the greenhouse can also pass back out through the glass
3) The shorter-wavelength infrared radiations from the Sun cannot enter into the greenhouse while longer-wavelength infrared radiations from the ground and the plants inside the greenhouse can pass back out through the glass
4) No infrared radiation can pass through the glass of the greenhouse
Q. What happens to the gravitational force between two objects if the mass of one object is doubled and the distance between them is also doubled?
1) The force would remain the same
2) The force would be doubled
3) The force would be halved
4) The force would increase by a factor of 4
Q. Which one of the following statements is not correct?
1) An electric motor converts electrical energy into mechanical energy
2) An electric generator works on the principle of electromagnetic induction
3) The magnetic field at the center of a long circular coil carrying current will be parallel straight lines
4) A wire with green insulation is usually the live wire of an electric supply
Q. What is the correct sequence of resistivity of silver, nichrome, and glass at room temperature?
1) Silver < Nichrome < Glass
2) Glass < Nichrome < Silver
3) Silver < Glass < Nichrome
4) Nichrome < Silver < Glass
Q. At the time of short-circuit, the current in the circuit -
1) reduces substantially
2) does not change
3) increases heavily
4) keeps on fluctuating
Q. If the magnification produced by a lens is + 2, then the image is -
1) erect, virtual and smaller than the object
2) inverted, real and smaller than the object
3) erect, virtual and larger than the object
4) inverted, real, and larger than the object
Q. Which law of Newton provides a quantitative definition of force?
1) Universal law of gravitation
2) Second law of motion
3) First law of motion
4) Third law of motion
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