288 questions
21
Mixed
Moderate
PYQ
+1.0
-0.33
Two lenses of power -15 D and +5 D are placed in contact with each other. The focal length of the combination is:
22
Mixed
Moderate
PYQ
+1.0
-0.33
Which of the following are characteristics of a good fuel?
23
Mixed
Moderate
PYQ
+1.0
-0.33
Which of the following is not a source of magnetic field?
24
Mixed
Moderate
PYQ
+1.0
-0.33
A shot is fired at 30° with the vertical from a point on the ground with kinetic energy K. If air resistance is ignored, the kinetic energy at the top of the trajectory is
25
Mixed
Moderate
PYQ
+1.0
-0.33
If two hemispheres of curved surface area 8π cm² each are joined together to form a sphere. What is the total surface area of the sphere?
26
Mixed
Moderate
PYQ
+1.0
-0.33
A spacecraft of mass 2000 kg moving with a velocity of 600 m/s suddenly explodes into two pieces. One piece of mass 500 kg is left stationary. The velocity of the other part must be (in m/s)
27
Mixed
Moderate
PYQ
+1.0
-0.33
Two plane mirrors are at 45° to each other. If an object is placed between them, then the number of images will be
28
Mixed
Moderate
PYQ
+1.0
-0.33
Reduce to linear form 15x+36x=23\frac{15x + 3}{6x} = \frac{2}{3}6x15x+3=32
29
Mixed
Moderate
PYQ
+1.0
-0.33
When objects at different distances are seen distinctly by the eye, which of the following remains constant:
30
Mixed
Moderate
PYQ
+1.0
-0.33
A ladder resting on the wall is grounded 3 metres away from the base of the wall. If the length of the ladder is 5m, what is the height at which it is resting on the wall?