Question Answers
Sahay Sir > Question Answers
Consider the situation shown in figure. Water ( mu = 4/3) is filled in a beaker up to a height of 10 cm. A plane mirror is fixed at a height of 5 cm from the surface fo water. Distance of image from the mirror
06
Oct
Consider the situation shown in figure. Water ( mu = 4/3) is filled in a beaker up to a height of 10 cm. A plane mirror is fixed at a height of 5 cm from the surface fo water. Distance of image from the mirror at which it will be totally internally reflected the angle [...]
A metallic right circular cone 20 cm high and whose vertical angle is 60 degree is cut into two parts at the middle of its height by a plane parallel to its base. If the frustum so obtained be drawn into a wire of diameter 16/1 cm, find the length of the wire.
06
Oct
A metallic right circular cone 20 cm high and whose vertical angle is 60 degree is cut into two parts at the middle of its height by a plane parallel to its base. If the frustum so obtained be drawn into a wire of diameter 16/1 cm, find the length of the wire. A metallic [...]
A container, opened from the top and made up of a metal sheet is in the form of a frustum of a cone of height 16cm with radii of its lower and upper ends as 8cm and 20cm respectively. Find the cost of the milk which can completely fill the container, at the rate of Rs 20 per litre. Also find the cost of metal sheet used to make the container , if it costs Rs 8 per 100 cm^2 . (Take π=3.14)
06
Oct
A container, opened from the top and made up of a metal sheet is in the form of a frustum of a cone of height 16cm with radii of its lower and upper ends as 8cm and 20cm respectively. Find the cost of the milk which can completely fill the container, at the rate of [...]
A candle is placed 20 cm from the surface of a convex mirror and a plane mirror is also placed so that the virtual images in the two mirrors coincide. If the plane mirror is 12 cm away from
06
Oct
A candle is placed 20 cm from the surface of a convex mirror and a plane mirror is also placed so that the virtual images in the two mirrors coincide. If the plane mirror is 12 cm away from A candle is placed 20 cm from the surface of a convex mirror and a plane [...]
A fez, the cap used by the Turks, is shaped like the frustum of a cone . If its radius on the open side is 10 cm, radius at the upper base is 4 cm and its slant height is 15 cm, find the area of material used for making it.
06
Oct
A fez, the cap used by the Turks, is shaped like the frustum of a cone . If its radius on the open side is 10 cm, radius at the upper base is 4 cm and its slant height is 15 cm, find the area of material used for making it. A fez find the [...]
The slant height of a frustum of a cone is 4 cm and the perimeters (circumference) of its circular ends are 18 cm and 6 cm. Find the curved surface area of the frustum.
06
Oct
The slant height of a frustum of a cone is 4 cm and the perimeters (circumference) of its circular ends are 18 cm and 6 cm. Find the curved surface area of the frustum. The slant height of a frustum of a cone is 4 cm and the perimeters (circumference) of its circular ends are [...]
A drinking glass is in the shape of a frustum of a cone of height 14 cm. The diameters of its two circular ends are 4 cm and 2 cm. Find the capacity of the glass.
06
Oct
A drinking glass is in the shape of a frustum of a cone of height 14 cm. The diameters of its two circular ends are 4 cm and 2 cm. Find the capacity of the glass. A drinking glass is in the shape of a frustum of a cone of height 14 cm. The diameters [...]
A farmer connects a pipe of internal diameter 20 cm from a canal into a cylindrical tank in his field, which is 10 m in diameter and 2m deep. If water flows through the pipe at the rate of 3 km/h, in how much time will the tank be filled?
06
Oct
A farmer connects a pipe of internal diameter 20 cm from a canal into a cylindrical tank in his field, which is 10 m in diameter and 2m deep. If water flows through the pipe at the rate of 3 km/h, in how much time will the tank be filled? A farmer connects a pipe [...]
Water in a canal, 6 m wide and 1.5 m deep, is flowing with a speed of 10 km/hr. How 3 much area will it irrigate in 30 minutes, if 8 cm of standing water is needed?
06
Oct
Water in a canal, 6 m wide and 1.5 m deep, is flowing with a speed of 10 km/hr. How 3 much area will it irrigate in 30 minutes, if 8 cm of standing water is needed? 6 m wide and 1.5 m deep if 8 cm of standing water is needed? is flowing with [...]
A cylindrical bucket, 32 cm high and with radius of base 18 cm, is filled with sand. This bucket is emptied on the ground and a conical heap of sand is formed. If the height of the conical heap is 24 cm, then find the radius and slant height of the heap.
06
Oct
A cylindrical bucket, 32 cm high and with radius of base 18 cm, is filled with sand. This bucket is emptied on the ground and a conical heap of sand is formed. If the height of the conical heap is 24 cm, then find the radius and slant height of the heap. 32 cm high [...]