The correct answer is:(c) both (a) and (b) A mixture can be made up of two or more elements (e.g., a mixture of oxygen and nitrogen gases) or two or more compounds (e.g., a mixture of water and alcohol). It can also contain both elements and compounds together. https://www.tiwariacademy.com/ncert-soRead more
The correct answer is:(c) both (a) and (b)
A mixture can be made up of two or more elements (e.g., a mixture of oxygen and nitrogen gases) or two or more compounds (e.g., a mixture of water and alcohol). It can also contain both elements and compounds together.
(a) Maximum in solids and minimum in gases. In solids, particles are tightly packed with strong intermolecular forces, keeping them in fixed positions. In gases, particles are far apart with very weak forces of attraction, allowing them to move freely. https://www.tiwariacademy.com/ncert-solutions/cRead more
(a) Maximum in solids and minimum in gases.
In solids, particles are tightly packed with strong intermolecular forces, keeping them in fixed positions.
In gases, particles are far apart with very weak forces of attraction, allowing them to move freely.
Ice – Homogeneous (solid form of water, same composition throughout). Air – Homogeneous (if pure and well-mixed, like clean air). (i) Ice and (iv) Air are homogeneous in nature. https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-2/
Ice – Homogeneous (solid form of water, same composition throughout).
Air – Homogeneous (if pure and well-mixed, like clean air).
(i) Ice and (iv) Air are homogeneous in nature.
(b) Speed of sound in air v = 330 m s⁻¹ Time gap between lightening and thunder clap t = 5.5 s ∴ Distance of flash s = vt = 330 x 5.5 = 1815 m https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-11/
(b) Speed of sound in air v = 330 m s⁻¹
Time gap between lightening and thunder clap t = 5.5 s
∴ Distance of flash s = vt = 330 x 5.5 = 1815 m
(a) Sound will be louder but pitch will not be different. When struck harder, amplitude of vibrations will be more and consequently a louder sound is produced. https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-11/
(a) Sound will be louder but pitch will not be different. When struck harder, amplitude of vibrations will be more and consequently a louder sound is produced.
(c) The only wrong statement is, "The object always goes away from the earth". There is no connection between an accelerated motion and going away from the earth. https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-8/
(c) The only wrong statement is, “The object always goes away from the earth”. There is no connection between an accelerated motion and going away from the earth.
(a) For pulses protein quality, for oil seed oil quality and for vegetable and fruit shelf life is important. https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-12/
(a) For pulses protein quality, for oil seed oil quality and for vegetable and fruit shelf life is important.
A mixture is made up of (a) two or more elements. (b) two or more compounds. (c) both (a) and (b). (d) none of these.
The correct answer is:(c) both (a) and (b) A mixture can be made up of two or more elements (e.g., a mixture of oxygen and nitrogen gases) or two or more compounds (e.g., a mixture of water and alcohol). It can also contain both elements and compounds together. https://www.tiwariacademy.com/ncert-soRead more
The correct answer is:(c) both (a) and (b)
A mixture can be made up of two or more elements (e.g., a mixture of oxygen and nitrogen gases) or two or more compounds (e.g., a mixture of water and alcohol). It can also contain both elements and compounds together.
https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-2/
See lessThe time period of a vibrating object is 0.005 s. The frequency of waves emitted by it is
(c) ∴ Time period T = 0.005 s ∴ Frequency v = 1/T = 1/0.005 = 200 Hz https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-11/
(c) ∴ Time period T = 0.005 s
∴ Frequency v = 1/T = 1/0.005 = 200 Hz
https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-11/
See lessForces of attraction are (a) maximum in solids and minimum in gases. (b) maximum in gases and minimum in solids. (c) maximum in liquids and minimum in gases. (d) maximum in gases and minimum in liquids.
(a) Maximum in solids and minimum in gases. In solids, particles are tightly packed with strong intermolecular forces, keeping them in fixed positions. In gases, particles are far apart with very weak forces of attraction, allowing them to move freely. https://www.tiwariacademy.com/ncert-solutions/cRead more
(a) Maximum in solids and minimum in gases.
In solids, particles are tightly packed with strong intermolecular forces, keeping them in fixed positions.
In gases, particles are far apart with very weak forces of attraction, allowing them to move freely.
https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-1/
See lessWhich of the following are homogeneous in nature?
Ice – Homogeneous (solid form of water, same composition throughout). Air – Homogeneous (if pure and well-mixed, like clean air). (i) Ice and (iv) Air are homogeneous in nature. https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-2/
Ice – Homogeneous (solid form of water, same composition throughout).
Air – Homogeneous (if pure and well-mixed, like clean air).
(i) Ice and (iv) Air are homogeneous in nature.
https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-2/
See lessA thunder clap is heard 5.5 s later than the lightning flash. The distance of the flash is: Speed of sound in air is 330 m s¯¹]
(b) Speed of sound in air v = 330 m s⁻¹ Time gap between lightening and thunder clap t = 5.5 s ∴ Distance of flash s = vt = 330 x 5.5 = 1815 m https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-11/
(b) Speed of sound in air v = 330 m s⁻¹
Time gap between lightening and thunder clap t = 5.5 s
∴ Distance of flash s = vt = 330 x 5.5 = 1815 m
https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-11/
See lessA key of a mechanical piano is struck gently and then struck again but much harder this time. In the second case
(a) Sound will be louder but pitch will not be different. When struck harder, amplitude of vibrations will be more and consequently a louder sound is produced. https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-11/
(a) Sound will be louder but pitch will not be different. When struck harder, amplitude of vibrations will be more and consequently a louder sound is produced.
https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-11/
See lessWhich among the following is/are necessary to solve the food problem of the country?
(d) All the statements are correct. https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-12/
(d) All the statements are correct.
https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-12/
See lessWhich of the following nutrient is not available in fertilisers?
(b) Fertilisers only contain NPK (Nitrogen, Phosphorus and Potassium). https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-12/
(b) Fertilisers only contain NPK (Nitrogen, Phosphorus and Potassium).
https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-12/
See lessWhich of the following statement is not correct for an object moving along a straight path in an accelerated motion?
(c) The only wrong statement is, "The object always goes away from the earth". There is no connection between an accelerated motion and going away from the earth. https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-8/
(c) The only wrong statement is, “The object always goes away from the earth”. There is no connection between an accelerated motion and going away from the earth.
https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-8/
See lessBaking quality is important feature of which crop?
(a) For pulses protein quality, for oil seed oil quality and for vegetable and fruit shelf life is important. https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-12/
(a) For pulses protein quality, for oil seed oil quality and for vegetable and fruit shelf life is important.
https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-12/
See less