A person driving a car with a speed 72 km/hr, suddenly sees a boy crossing the road. If the distance moved by car, before the person applies brakes is 5 m, the reaction time of the person is 1) 0.5 s 2)0.15 s 3) 10 s 4) 0.25...
aabhamisra
Asked:
December 2022
A convex lens is given, for which the minimum distance between an object and its real image is 40 cm. An object is placed at a distance of 15 cm from this lens. The linear magnification of adjustment will be 1) 1 2) -2 3) 2 4) 1/2
aabhamisra
Asked:
December 2022
A particle is located midway between two point masses each of mass M kept at a separation 2d. The escape speed of the particle is (neglect the effect of any other gravitational effect) 1) sqrt (2GM/d) 2) 2 sqrt (GM/d) 3) sqrt (3GM/d) 4) sqrt (GM/2d)
aabhamisra
Asked:
December 2022
A body thrown vertically upward with initial speed sqrt (gR), where R is the radius of earth. Then maximum height reached by body from the surface of earth is 1) R/2 2) 3R/2 3) R 4) R/4
aabhamisra
Asked:
December 2022
Chromatic aberration of a lens can be corrected by 1) Reducing its aperture 2) Proper polishing of its aperture 3) Suitably combining it with another lens 4) Providing different suitable curvature to its surface.
aabhamisra
Asked:
December 2022
A ball is projected horizontally from a tower of height 80 m with 10 m/s. Find the velocity and angle it is making with the horizontal after 1 second. Also find the height of ball at this instant.
aabhamisra
Asked:
December 2022
The change in a vector may occur due to 1) Rotation of frame of reference 2) Translation of frame of reference 3) Rotation of vector 4) Both (1) & (3) Give the answer alongwith explaination for every option.
aabhamisra
Asked:
December 2022
A balll is projected with initial speed of 40 m/s making an angle of 30 degrees with the horizontal. Find (1) Vertical displacement (2) Horizontal displacement (3) velocity and angle it is making with horizontal at t=1 and t=3 sec.
Please answer this question with explaination about every option
aabhamisra
Asked:
December 2022
One of the rectangular components of a force of 40 N is 20 N. Find the angle it makes with this component. So how we know that it is the component along x axis or y axis?
aabhamisra
Asked:
December 2022
Which one of the following pair cannot be the rectangular components of force vector of 10 N? (1) 6 N & 8 N (2) 7 N & sqrt(51) (3) 6sqrt(2) & 2sqrt(7) (4) 9 N & 1 N Now we are not given the value of angle between...
aabhamisra
Asked:
December 2022
Find the time in which distance between ships is minimum. Answer with explainations please.
Find the resultant of two vectors P = 3 i + 2 j and Q = 2 i + 3 j. In solution of this question to find resultant they have directly added P and Q and then found magnitude of it. But they have not used the...
aabhamisra
Asked:
December 2022
An example of non - benezoid compound is (See the attachement) Please answer with explaination as answer is option (2) but I think answer should be (3)
aabhamisra
Asked:
December 2022
Which of the following does not confer stability to the helical structure of DNA? 1) Phosphodiester bond 2) H-bond 3) N-glycosidic bond 4) More than one option is correct
aabhamisra
Asked:
December 2022
In preparation of alkene from alcohol using Al2O3 which is effective factor : - (1) Porousity of Al2O3 (2) Temperature (3) Concentration (4) Surface area of Al2O3
aabhamisra
Asked:
December 2022
A tall man of height 6 feet, want to see his full image. Then required minimum length of the mirror will be : (1) 12 feet (2) 3 feet (3) 6 feet (4) Any length Answer with explaination