NTA (UGC) NET Paper 1 Questions (Part 2 of 30)
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- A mass m (200 g) slides horizontally due to a downward force applied by a 500 g weight (as shown in figure) . The velocity of the mass m (ignoring friction)
- increases as a function of time with constant acceleration
- remains constant
- changes with time with increasing acceleration
- changes with time with decreasing acceleration
- The O-H bonds in water molecule are polar. The molecule is symmetric and the H-O-H bond angle is approximately 107 . The dipole moment vector of the molecule is
- zero
- along the OH bond
- randomly oriented
- along the bisector of the H-O-H angle
- You wish to observe a small organism closely, using a convex lens. If you wish to avoid distortion of the image, you should keep the object
- at a distance greater than the focal length
- less than the focal length
- at twice the focal length
- exactly at the focal length
- A charged particle moving with a constant velocity enters a magnetic field perpendicular to its velocity.In which direction y an electric field should be applied to compensate the magnetic force?
- Along the initial velocity
- Perpendicular to the initial velocity and parallel to the magnetic field
- Perpendicular to both, the initial velocity and the magnetic field
- Along the magnetic field
- Two pendula of lengths l1 and l2 (= 2l1) have the same period at two different locations. The accelerations due to gravity at these two locations, g1 and g2, are related by
- g1 = g2
- g1 = 2g2
- g2 = 2g1
- g2 = 4g1
- Water rises naturally out of an artesian well because
- the water has lots of dissolved gases
- the water table is at the ground level
- the water table is below the ground level
- the water table is above the ground level
- Although, we know from chemical evidence that life on Earth evolved as early as 3.5 billion years ago, the most ancient available fossils are only 0.54 billion years old. This is because
- acidic ocean dissolved all life forms
- early life forms were soft bodied
- rocks older than 0.54 billion years do not exist
- a large asteroid impact destroyed all earlier records
- During alpha decay of a radioactive atom, the mass number reduces by 4 units and the atomic number decreases by 2 units. How many alpha particles will be generated during the decay of a 238,92U atom to a 206 − 82 Pb atom
- 8
- 16
- 10
- 5
- Depletion of ozone layer and formation of ozone hole in polar regions is a phenomenon occurring in the
- troposphere
- mesosphere
- stratosphere
- thermosphere
- Sea levels are predicted to rise in the near future mainly due to
- sinking of landmass
- increased rainfall
- gravitational pull of the moon
- melting of glaciers